JP2010178027A - Camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform photometric operation and exposure control with higher precision while improving a delay of the photometric operation and exposure control operation due to a narrow dynamic range of an imaging element at power-on time, when a photographic mode is changed or when luminance change accompanying composition change etc., occurs during live-view display or moving picture photography. <P>SOLUTION: During the live-view display or moving picture photography, the normal photometry by a photometric sensor and imaging plane photometry by an imaging element are simultaneously performed. In the photometric dynamic range of the imaging element, the exposure control is carried out using imaging plate photometric information, but the exposure control is performed using information of the normal photometry by the photometric sensor at power-on time, when the photographic mode is changed, or when abrupt luminance change occurs. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique and apparatus for performing exposure control with higher accuracy and better response when performing exposure control in live view mode or moving image shooting.

  In recent years, compact digital cameras that can display image information imaged on an image sensor through a predetermined optical system on a rear monitor or the like or display on an electronic viewfinder (also referred to as EVF) have been widely used. Has been.

  In these digital cameras, the image information actually captured through the image sensor is displayed as it is, or various shooting information, camera side control information, etc. are viewed together with the monitor image on the rear monitor or electronic viewfinder. This makes it possible to shoot according to the photographer's intention and is very easy to use.

  Also, as an optical device such as an optical viewfinder and a digital single-lens reflex camera that can perform electronic viewfinder display or rear monitor display / live view display, JP 2003-287780 A discloses a main mirror that is a half mirror in the optical viewfinder state. When the optical path of the shooting area is guided onto the optical viewfinder by reflection of the main mirror and the rear monitor display / live view display is performed, the main mirror remains down but the position of the main mirror is moved to the AF unit. A technology has been proposed in which the rear monitor display and live view display are performed while conducting the phase difference AF operation while guiding the optical path of the imaging area to the image sensor side through the main mirror as a half mirror by arranging it at the position to guide the light. ing. If this method is used, AF can be performed without using contrast AF (also referred to as TVAF) using image information on the imaging surface for focusing when performing rear monitor display / live view display. Focusing can be performed quickly, and even when a fast-moving subject or composition is changed, it is possible to immediately perform focusing display and subsequent still image shooting. According to Japanese Patent Laid-Open No. 2003-287780, in the moving image shooting mode, the main mirror is retracted to the optical viewfinder side, and the light beam from the shooting lens is directly guided to the image pickup device, thereby taking a moving image without loss of light quantity such as a half mirror. Can do.

  When performing digital view live view display or movie shooting, photometric information is converted directly or indirectly into photometric information from image data from the image sensor, and the aperture, shutter speed, and ISO sensitivity are converted based on this information. The exposure control operation was performed.

  In JP-A-2005-292525, in the first optical path splitting state in which the optical path from the photographing lens is guided to the optical viewfinder, a photometric operation is performed using a photometric sensor installed on the side of the optical viewfinder. Proposals have been made to perform photometric operations using the image sensor in the second and third optical path division states that guide the light flux to the image sensor, and to perform exposure control operations based on the photometric data obtained from these photometric operations. .

  In addition, as a publicly-known photometric technique for cameras, Japanese Patent Application Laid-Open No. 07-0667027 discloses a photometric sensor and a distance measuring sensor for moving images and still images, respectively. First, focus using a distance measuring and photometric sensor for moving images. A technique has been proposed for adjusting the exposure and adjusting the exposure, and then using a distance measurement and photometry sensor for still image shooting. According to this, still image shooting can be easily performed even during moving image shooting, and shooting suitable for focusing and exposure accuracy as a still image can be performed.

Japanese Patent Laid-Open No. 10-161014 proposes a photometric operation using a two-dimensional sensor having a wide distance measuring area, and Japanese Patent Application No. 0537145 discloses a focus detection device unit for a single lens reflex camera with a distance measuring sensor and a photometric sensor. Proposed arrangements have been made.
JP 2003-287780 A JP 2005-292525 A JP 07-0667027 A JP-A-10-161014 Patent registration No. 0253145

  During the conventional live view display and movie shooting, the dynamic range of the image sensor is much narrower than that of a general photometric sensor. It is often out of focus, and it takes a considerable amount of time to achieve an appropriate exposure because it controls the exposure metering range while performing metering operations many times and then controls exposure. I was sorry. This is not only when the power is turned on, but also when the camera is switched from the still image shooting state to the live view display mode or the moving image shooting mode.

  Even after the power is turned on, or after changing from the still image shooting state to the live view display mode or moving to the movie shooting mode, the exposure control operation is almost stabilized, for example, from the sun to the shade or by changing the composition / scene etc. There have also been many cases where the proper luminance at the frame changes significantly. Even in such a case, a time lag of several frames is generated until the luminance becomes appropriate.

  Further, in photometry using an image sensor, since it takes one frame of photometry time even in the shortest time due to the system configuration, the time lag is inevitably inferior to that of a dedicated AE sensor.

  In view of the above problems, the present invention is suitable for a live view display image / moving image as well as a general live view display device or moving image shooting device, or a camera system similar to Japanese Patent Laid-Open No. 2003-287780. Providing methods and equipment that can obtain photometric information and perform responsive photometry and exposure control even when the power is turned on, the mode is changed, or there is a sudden change in brightness due to composition or scene changes. The purpose is to do.

In order to achieve the above object, in the camera system of the present invention, a photographic lens, an image sensor for capturing an object image by the photographic lens, display means for displaying image data from the image sensor, and image data are provided. A first metering mode for metering the brightness of the object image from image data of the image sensor; and a metering unit separate from the recording unit for recording and the image sensor for measuring the brightness of the object image; The second metering mode is used for metering by means, and the information of the first metering mode and the second metering mode is used selectively or in combination when performing live view display or movie shooting. It is characterized by doing.

  More specifically, during live view display or movie shooting, when the power is turned on, or when switching to the live view display mode and movie shooting mode, the metering operation is first performed in the second metering mode by the metering means. Next, the photometric operation is performed in the first photometric mode using the image sensor.

  Alternatively, at the time of live view display or moving image shooting, the photometry operation is performed by the first / second photometry mode by the image sensor and the photometry means at all times or intermittently, and usually the photometry information by the first photometry mode is used. When the exposure control operation is performed by the exposure control means, and the photometry information in the second photometry mode changes more than a predetermined value, the exposure control means uses the photometry information in the second photometry mode. The exposure control operation is performed by the above.

  Alternatively, when switching to the live view display mode and the moving image shooting mode, the photometry operation is performed in the second photometry mode by the photometry means, and then the live view display mode and the moving image shooting mode are switched.

Further, the camera system of the present invention is formed through the photographing lens, the optical path dividing means for dividing the optical path from the photographing lens, the imaging element for picking up the object image by the photographing lens, and the optical path dividing means. An optical viewfinder for observing the object image with the photographic lens, the first photometric means for measuring the brightness of the object image, and changing the aperture, shutter speed, ISO sensitivity, etc. based on the photometric information to achieve an appropriate exposure amount Exposure control means for performing control, and display means for displaying an object image formed on the image sensor on a display body typified by an electronic viewfinder or a rear monitor,
Focus detection means for detecting the imaging state of the photographic lens, a distance measuring sensor in the focus detection means (hereinafter also referred to as “second photometry means”) or a distance measurement sensor in the focus detection means The third photometric means, or the fourth photometric means that measures the brightness of external light and controls the amount of light emitted from the strobe by measuring the amount of light reflected on the screen of the shutter or image sensor, or directly without using a photographic lens Having a fifth photometric means for measuring the brightness of the object image;
The optical path splitting means can selectively take the first optical path split state, the second optical path split state, and the third optical path split state, and is in the first optical path split state. The optical path from the photographic lens is divided into the optical viewfinder and the first photometry means / focus detection means, and in the second optical path division state, the optical path from the photographic lens is divided into the imaging element and the focus. Dividing into detection means and third photometry means, and in the third optical path division state, from the inside of the optical path of the photographic lens and the imaging element to the position where the optical path division means is directly imaged from the photographic lens to the imaging element In a camera system configured to be evacuated,
In the first optical path division state, the exposure control operation is performed based on the photometric information of the first photometry means, and in the second optical path division state, the focus detection means or the third photometry means which is also the second photometry means Exposure control operation is performed by selectively or combinedly using the photometric information obtained from the photometric means or the fourth photometric means or the fifth photometric means and the photometric information obtained from the pixel data of the image sensor. In the third optical path division state, the exposure control operation is performed based on the pixel data of the image sensor or the photometric information obtained from the fourth photometric means or the fifth photometric means.

  Also in these cases, when the live view display or moving image shooting is performed, when the power is turned on or when the mode is switched to the live view display mode and the moving image shooting mode, the focal length detection unit or the third photometry unit is initially set as the second photometric unit. The photometric operation is performed by the photometric means, the fourth photometric means, or the fifth photometric means, and then the photometric operation using the image sensor is performed.

  Also, during live view display or moving image shooting, the photometry operation is performed by the focal length detection means, the third photometry means, the fourth photometry means, or the fifth photometry means, which is also the image sensor and the second photometry means. Usually, exposure control operation is performed by the exposure control means using photometric information using an image sensor, and the focal length detection means or third photometric means or fourth photometric means which is also the second photometric means Alternatively, when the photometric information by the fifth photometric unit changes more than a predetermined value, the focal length detection unit, the third photometric unit, the fourth photometric unit, or the fifth photometric unit is also the second photometric unit. The exposure control operation is performed by the exposure control means using the photometric information by the photometric means.

  When the first optical path splitting state is switched to the second optical path splitting state or the third optical path splitting state, the photometry operation by the first photometry means is first performed in the first optical path splitting state. The exposure control operation is performed by the previous exposure control means, and then the switching operation is performed to the second optical path split state or the third optical path split state.

  As described above, according to the present invention, it is possible to obtain appropriate photometric information with high accuracy based on information of a captured image as a live view display image / moving image shooting, and when the power is turned on or the mode is changed, or Even when there is a sudden change in luminance due to composition / scene change, it is possible to perform photometric operation / exposure control operation with good response.

  Next, details of the present invention will be described in accordance with the description of the embodiments.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view of a digital single-lens reflex camera according to the present invention.

  In FIG. 1, 101 is a camera body, 102 is a detachable photographic lens, 103 is an imaging optical system that is disposed in the photographic lens 102 and forms an object image on an image sensor, and 104 is in the photographic lens 102. An aperture mechanism that controls exposure by changing the aperture diameter, 105 is a main mirror composed of a movable half mirror that divides the optical path from the imaging optical system 103 on the optical viewfinder side, and 106 is a movable sub-mirror. Of the light beams that are provided behind the main mirror 105 and pass through the main mirror 105, a light beam close to the optical axis is deflected to the focus detection means 107.

  Reference numeral 108 denotes a shutter mechanism, which retracts the main mirror 105 and the sub mirror 106 and opens the shutter mechanism 108 at the time of shooting, monitor display / moving image shooting, and directs the light flux from the shooting lens 102 directly to the image sensor 109. To work.

  Reference numeral 110 denotes display means represented by a rear monitor.

  Reference numeral 111 denotes a focusing screen arranged on the image plane of the object image, 112 denotes a pentaprism, and 113 denotes an eyepiece for observing the optical viewfinder image. The focusing screen 111, the pentaprism 112, and the eyepiece 113 constitute a finder optical system 114. Reference numeral 131 denotes a photometric means, which is disposed inside the finder optical system 11.

  115 is a main sw, 116 is a release sw, and 117 is a viewfinder mode switching sw.

  FIG. 2 is a block diagram showing the electrical configuration of the digital single-lens reflex camera of the present invention.

  In FIG. 2, 101 is a camera body, 102 is a photographing lens, 103 is an imaging optical system in the photographing lens, 104 is an aperture mechanism, 105 is a main mirror, 106 is a sub mirror, 107 is a focus detection means, 108 is a shutter mechanism, 109 is an image sensor, 120 is an AD conversion means for AD-converting an image signal from the image sensor 109, 121 is various corrections of pixel information based on the image signal from the image sensor that has been AD-converted, and the YBG signal of the RBG signal Imaging processing means for performing image conversion, white balance processing, gamma correction processing, signal interpolation processing, and the like, 122 is a recording means for recording image information obtained by the imaging processing means 121, and 123 is various circuits and processing means of a digital camera. A control means 124 for controlling the reproduction of the image information recorded by the recording means 122 so that the image information can be displayed on the display means 110. Means, 125 main SW115 · release Sw116, input means having a finder mode switching sw117 like, exposure control means for controlling the exposure by 126 to control the diaphragm mechanism 104, a shutter mechanism 108, 131 is a light measuring unit.

  The operation of the present invention configured as described above will be described with reference to the flowchart of FIG.

  First, the control means 123 determines whether the main sw 115 is turned on by the input means 125 and the power is turned on, or whether the release sw 116 is half-pressed and the camera is activated (# 101).

If it is determined in step 101 that the power is turned on or the camera is activated, the control means 123 instructs the photometry means 131 to perform photometry, and the photometry means 131 actually performs photometry (# 102). Based on the photometric result of the photometric unit 131, the exposure control unit 126 controls the diaphragm mechanism 104 and the like, and performs exposure control so that an appropriate exposure amount of light enters the image sensor. (# 103)
Next, it is determined whether or not the live view display mode has been set in the finder mode switching sw117 (# 104). If it is determined in step # 113 that it is not a moving image shooting, the process goes to step 114 to determine again whether it is the live view display mode.
If it is determined in step # 104 that the live view display mode is set, the main mirror 105 and the sub mirror 106 are moved to predetermined positions, the shutter mechanism 108 is opened, and the light flux is directly applied to the image sensor 109 via the photographing lens 102. Works to guide you. The photometry unit 131 actually performs photometry (# 105), and the exposure control unit 126 controls the diaphragm mechanism 104 and the like based on the photometry result of step # 105, so that an appropriate exposure amount of light enters the image sensor. Thus, exposure control is performed (# 106).

When the appropriate exposure state is obtained, the light incident on the image sensor 109 via the photographing lens 102 is converted into a digital signal by the AD converter 120, and various corrections of pixel information and RBG signals are performed by the image processor 121. Are converted into YC signals, white balance processing, gamma correction processing, signal interpolation processing, and the like, and the image data is resized to the display size by the reproduction means 124 and displayed on the display means 110 as a so-called live view display. . (# 107)
Thereafter, during the live view display period, photometry is actually performed by the photometry means 131 (# 108), and imaging surface photometry is performed using the image information imaged on the image sensor 109 (# 109).

  Then, the photometric information by the photometric means 131 is compared with the photometric information by the image sensor 109 (# 110). If the difference is smaller than the predetermined value in step # 110, exposure control is performed by the exposure control means 126 based on the photometric information of the imaging surface photometry calculated from the actual image information assuming that there is not much luminance change. (# 111).

  On the other hand, if the difference is larger than the predetermined value in step # 110, there is a large luminance change or scene change during the live view display, and the photometry by the AE sensor by the photometry means 131 responded instantly, but the image sensor In the case of imaging surface photometry by 109, it is assumed that there is a difference in photometric information depending on whether the information of the previous frame remains as it is or if the signal is out of the dynamic range and cannot be measured correctly. Exposure control is performed by the exposure control means 126 (# 112).

  Then, it is determined whether or not movie shooting is performed (# 113). If it is determined that movie shooting is not performed, the process goes to step # 114 to determine whether or not the live view display is ended (# 114).

  If it is determined in step # 114 that the live view display is continued, the process returns to step # 107, and thereafter the same processing is repeated.

  When it is determined in step # 114 that the live view display is finished, the series of operations is finished.

  If it is determined in step # 113 that movie shooting is to be performed, in order to quickly confirm / control the photometric state, the photometric unit 131 actually performs photometry (# 115), and the exposure control unit 126 is based on the photometric result of step # 115. Controls the aperture mechanism 104 and the like, and performs exposure control so that an appropriate exposure amount of light enters the image sensor (# 116).

  In the same way as the photometry control in the live view display mode, photometry is actually performed by the photometry means 131 (# 117), and imaging surface photometry is performed using the image information imaged on the image sensor 109 (# 117). # 118).

  Then, the photometric information by the photometric means 131 is compared with the photometric information by the image sensor 109 (# 119). In step # 119, if the difference is smaller than the predetermined value, exposure control is performed by the exposure control means 126 based on the photometric information of the imaging surface photometry obtained by calculating the photometric information from the actual image information on the assumption that there is not much luminance change. (# 120).

  On the other hand, if the difference is larger than the predetermined value in step # 119, there is a large luminance change or scene change during moving image shooting. In the case of photometry, the exposure control means 126 is based on the photometry information obtained by the photometry means 131, assuming that the information of the previous frame remains unchanged or that the signal is out of the dynamic range and cannot be measured correctly. To control exposure (# 121).

  When the proper exposure state is obtained from step # 119 to step # 121, moving image shooting and storage thereof are performed (# 122).

  Then, it is determined whether or not the moving image shooting is finished (# 123). If it is determined in step # 123 that movie shooting is to be continued, the process goes to step # 117, and thereafter the same processing is repeated.

  If it is determined in step # 123 that moving image shooting has been completed, the series of operations is terminated.

  As described above, according to the present invention, exposure control is performed on the basis of imaging surface photometry information during live view display image / video shooting, so that it is possible to obtain appropriate photometry information with higher accuracy, Even when the mode is changed or when there is a sudden change in brightness due to composition / scene change, exposure control is performed based on the photometry information of the dedicated photometry means. It becomes possible.

  In the first embodiment of the present invention, the photometric means uses the photometric means 131 in the finder optical system 114, but the present invention is not limited to this. If a metering unit different from imaging surface metering is provided for live view display or movie recording / recording and direct metering operation is performed, the same effect can be obtained without being limited to the arrangement and metering method of the metering unit. it can.

  In the present invention, the main mirror / submirror is compared and the shutter is opened to perform live view display or moving image shooting / recording operation. However, the present invention is not limited to this operation. Since it is sufficient if light is actually guided to the image sensor side during live view display or moving image recording / recording, the same effect can be obtained even in a system where the main mirror is a full mirror or no main mirror itself. be able to. In addition, the shutter mechanism is described assuming that the mechanical shutter mechanism is opened and closed, but the same applies even if this is such that an electronic shutter always shines and starts and ends accumulation control at a specific timing. An effect can be obtained.

  Further, in the present invention, during live view display or movie shooting, exposure control is performed using information on either exposure control by imaging surface photometry or exposure control by photometry means. Depending on the situation, the two types of metering information can be mixed to change the weighting, or each metering information can be mixed and the weighting can be changed over time after the luminance difference has occurred. A more effective effect can be obtained by adjusting (adjustment that exposure information changes rapidly or exposure information does not change easily).

  FIG. 4 is a cross-sectional view of a digital single-lens reflex camera according to another embodiment of the present invention.

  In FIG. 4, 101 is a camera body, and 102 is a detachable photographing lens.

  Reference numeral 103 denotes an image forming optical system that is arranged in the photographing lens 102 and forms an object image on an image pickup device or the like. Reference numeral 104 denotes a diaphragm mechanism that is in the photographing lens and controls exposure by changing the diameter of the diaphragm. Reference numeral 105 denotes a main mirror composed of a movable half mirror that divides the optical path from the imaging optical system 103 on the optical viewfinder side. Reference numeral 106 denotes a movable sub-mirror, which is provided behind the main mirror 105 and includes the main mirror 105. Of the transmitted light flux, the light flux close to the optical axis is deflected to the focus detection means 107 (the focus detection means 107 is also referred to as the second photometry means 132) and the third photometry means 133.

  The optical separation system composed of the main mirror 105 and the sub mirror 106 is a first optical path separation for guiding light to the finder optical system 114, the focus detection means 107 and the third photometry means 133 by a mirror drive mechanism (not shown). State, second optical path separation state for guiding light to the image sensor 109 via the focus detection means 107, the third photometry means 133 and the half mirror, for directing the light flux from the photographing lens to the image sensor 109 The third optical path splitting state can be selectively taken. The sub mirror 106 is housed in the lower part of the mirror box in the second optical path division state and the third optical path division state in conjunction with the movement of the main mirror 105. In these first optical path division states, the first photometry means 131 performs the photometry operation, the focus detection means 107 performs the focus detection operation, and the optical viewfinder 114 observes the object image. In the third optical path separation state, the imaging surface photometry / ranging operation by the image sensor 109 for the photometry operation by the photometric means 133 or the photometry operation and focus detection operation by the focus detection means 107 and live view display or high-speed shooting. It is used for high-definition still image shooting that is optimal for moving image shooting and large prints.

  Reference numeral 111 denotes a focusing screen arranged on the image plane of the object image, 112 denotes a pentaprism, and 113 denotes an eyepiece for observing the optical viewfinder image. The focusing screen 111, the pentaprism 112, and the eyepiece 113 constitute a finder optical system 114. In the finder optical system 114, a first photometry means 131 that performs photometry via the finder optical system is disposed.

  115 is a main sw, 116 is a release sw, and 117 is a viewfinder mode switching sw.

  131 is a first photometric means in the finder optical system 114, 132 is the same means as the focus detection means 107, and the second photometry means for calculating photometric information by changing the processing algorithm (hereinafter the focus detection means 107 is the first one). 2 is a third photometric unit different from the distance measuring sensor in the focus detection unit, and 134 is a photometric measure of the amount of screen reflection of the shutter or the image sensor. The fourth photometric means for measuring the brightness of external light and controlling the amount of light emitted by the strobe, 135 is a so-called external photometry means for directly measuring the brightness of an object image without using a photographing lens. The fifth photometric means.

  In FIG. 4, the photometry operation is performed as the second photometry means 132 using the focus detection means 107, and the outline thereof will be described with reference to FIG.

  FIG. 5A schematically shows light guided to the focus detection unit 107, and the light beam that has passed through the imaging optical system 103 is guided into the focus detection unit 107 via the main mirror 105 and the sub mirror 106. It is burned. (In FIG. 5, the main mirror 105 and the sub mirror 106 are omitted for the sake of schematic representation.) In the focus detection means 107, two images are formed by the field lens 107-1, the mask 107-2, and the eyeglass lens 107-3. Is re-imaged and guided onto the distance measuring sensor 107-4.

  FIG. 5-2 shows a pixel arrangement of the distance measuring sensor 107-4. The distance measuring sensor 107-4 arranges a pair of line sensors 107-4A and 107-4B corresponding to two images, and outputs luminance information of each pixel of each line sensor, whereby the subject image has a luminance. Output information.

  When distance measurement is performed based on the subject image data, the defocus amount is obtained by obtaining the correlation (degree of image interval) between the two images.

  In the case of performing photometry, as shown in FIG. 5-3, the luminance of each pixel can be obtained from the accumulation time and the magnitude of the image output. In other words, the accumulation time becomes shorter as the luminance becomes higher, the accumulation time becomes longer as the luminance becomes lower, and when the luminance becomes darker than the luminance that became the longest accumulation time, the size of the image data output of the pixel is reduced. It gets smaller. Photometric information of the subject is obtained by averaging these pieces of information for a predetermined area, obtaining a maximum value, or obtaining an intermediate value.

  The third photometric means in FIG. 4 will be described with reference to FIG.

  FIG. 6A shows an example in which a distance measuring line sensor and a photometric photodiode are arranged in the distance measuring sensor 107-4.

  Here, 107-4A and 107-4B are line sensors for outputting the A and B images in FIG. 5-2, and 107-4C is disposed between the line sensors 107-4A and 107-4B, and is located on the subject side. It is the 3rd photometry sensor comprised by the photodiode etc. which output photometry information.

  The third photometry means in the focus detection means 107 may be a line sensor for distance measurement and a photodiode for photometry in the same semiconductor as shown in FIG. 6, or Japanese Patent No. 0253145. The configuration shown in the publication may be used.

  The fourth photometry means 134 and the fifth photometry means 135 in FIG. 4 are conventionally known screen surface photometry means and external photometry means, and detailed description thereof is omitted here.

  Next, the optical path division of the camera configured as described above will be described in more detail with reference to FIG.

  In FIG. 7, the main mirror 105 in the first optical path division state (FIG. 7-1), the second optical path division state (FIG. 7-2), and the third optical path division state (FIG. 7-3). The arrangement of the sub-mirror 106 is shown.

  In the first optical path separation state (FIG. 7-1), the main mirror 105 is obliquely disposed so that the lower surface is closer to the photographing lens, reflects light to the optical viewfinder side (upper side), and the sub mirror 106 has the upper surface. It is arranged obliquely closer to the photographic lens, and reflects the light transmitted through the main mirror 105 to the focus detection means 107 side and the third photometry means 133 side (lower side).

  In the second optical path separation state (FIG. 7-2), the main mirror 105 is obliquely disposed so that the upper surface is closer to the taking lens 102, and the focus detection means 107 side and the third photometry means 133 side (lower side). The light is reflected on the image sensor 109 and the light is transmitted to the image sensor 109 side. At that time, the sub mirror 106 is disposed at a position (lower side) where light is not emitted.

  In the third optical path division state (FIG. 7-3), both the main mirror 105 and the sub mirror 106 are arranged at positions where light is not emitted (the main mirror is on the upper side and the sub mirror is on the lower side), and the image is directly formed on the image sensor 109 side. Is done.

  FIG. 8 is a block diagram showing the electrical configuration of a digital single-lens reflex camera showing another embodiment of the present invention.

  In FIG. 8, 103 is an imaging optical system in the photographic lens, 104 is a diaphragm mechanism, 105 is a main mirror, 106 is a sub mirror, 107 is a focus detection means, 108 is a shutter mechanism, 109 is an image sensor, and 120 is an image sensor 109. AD conversion means for AD-converting the image signal from A, 121 is a variety of correction of pixel information, conversion of RBG signal to YC signal, white balance processing, gamma correction processing based on the AD-converted image signal from the image sensor Imaging processing means for performing signal interpolation processing, etc. 122 is recording means for recording image information obtained by the imaging processing means 121, 123 is control means for controlling various circuits and processing means of the digital camera, and 124 is recording means 122. Reproducing means for reproducing the image information recorded by the display means 110 so that the information can be displayed on the display means 110; Sw116, input means having a finder mode switching sw117 like, 126 is an exposure control means for controlling the exposure by controlling the aperture mechanism 104 and the shutter mechanism 108.

  131 is a first photometry unit in the finder optical system 114, 132 is the same unit as the focus detection unit 107, second photometry unit for calculating photometry information by changing the processing algorithm, and 133 is in the focus detection unit. Third photometric means different from the distance measuring sensor, 134 is a fourth photometric means for measuring the brightness of the external light and controlling the light emission amount of the strobe by measuring the amount of light reflected on the screen of the shutter or the image sensor. Reference numeral 135 denotes a fifth photometric unit which is a so-called external photometric unit that directly measures the brightness of an object image without using a photographing lens.

  The operation of the present invention configured as described above will be described with reference to the flowcharts of FIGS.

  First, the control means 123 determines whether the main sw 115 is turned on by the input means 125 and the power is turned on, or whether the release sw 116 is half-pressed and the camera is activated (# 201).

When it is determined in step # 201 that the power is turned on or the camera is activated, the control unit 123 instructs the first photometric unit 131 to perform photometry, and the first photometric unit 131 actually performs photometry. (# 202). Then, based on the photometric result of the first photometric means 131, the exposure control means 126 controls the aperture mechanism 104 and the like, and performs exposure control so that an appropriate exposure amount of light enters the image sensor. (# 203)
Next, it is confirmed whether or not the finder switching mode sw117 is input from the input means 125 (# 204).

  When the finder mode switching sw is newly input, the setting of the newly set mode is changed together with past information, and if the finder switching sw is not newly input, the current mode is maintained. (# 205).

  Next, based on the mode set in step # 205, it is determined what the display mode at that time is (# 206).

  If the display mode is the OVF mode in step # 206, the process proceeds to step # 207 to determine whether or not the display mode has been changed (# 207).

  When the display mode is changed in step # 207, the main mirror 105, the sub mirror 106, and the like are moved to the first optical path division state (# 208).

  If the display mode is not changed in step # 207, the current optical path division state is maintained, and the process proceeds to step # 209.

  In step # 209, for example, the state of the release sw 116 of the input unit 125 is detected, and it is determined whether to prepare for photographing (# 209).

  When the release sw 116 is pressed halfway to prepare for shooting, first, the first photometry means 131 actually performs the photometry operation (# 210). Based on the photometric result of the first photometric means 131, the exposure control means 126 controls the aperture mechanism 104 and the like and determines the shutter time (# 211). Then, various other shooting preparation operations are performed (# 212).

  Next, the input means 125 detects whether or not the release sw 116 is fully pressed (# 213). If the release sw is not fully pressed, the process returns to step # 213 and waits until the release sw is fully pressed.

  If it is determined in step # 213 that the release sw has been fully pressed, highly accurate still image shooting is performed. That is, first, the control unit 123 controls the optical path switching unit (not shown) to switch the optical path from the first optical path division state to the third optical path division state (# 214). From the arrangement for guiding the light beam of the photographing lens 102 to the viewfinder optical system 114 and the focus detection means 107 side described in FIG. 7-1) by this operation, the photographing lens described in FIG. 7-3). The optical path is switched to an arrangement in which the light beam 102 is directly guided to the image sensor 109.

  Then, the light from the photographing lens 102 is directly opened by the shutter mechanism 108 for the shutter time determined in step # 211 without passing through the main mirror, and the light is guided to the image sensor 109 to take a still image. After that, a known still image shooting / recording operation is performed such that the light accumulated in the image sensor 109 is AD converted, and appropriate processing is performed by the imaging processing unit 121 and the resulting image information is stored in the storage unit 122. (# 215).

  Then, the optical path switching means (not shown) is controlled again to switch the optical path from the third optical path splitting state to the first optical path splitting state (# 216). With this operation, the arrangement described in FIG. 7-3) directly guides the light beam of the photographing lens 102 to the image sensor 109. The light beam of the photographing lens 102 described in FIG. The optical path is switched to an arrangement leading to the system 114 and the focus detection means 107 side. And a series of operation | movement is complete | finished.

  If it is determined in step # 206 that the display mode is the live view mode, the process proceeds to step # 217 to determine whether or not the display mode has been changed (# 217).

  If the display mode is changed in step # 217, first the photometry operation is actually performed by the first photometry means 131 (# 218). Based on the photometric result of the first photometric means 131, the exposure control means 126 controls the aperture mechanism 104 and the like and determines the shutter time (# 219). Then, the optical path switching means (not shown) is controlled to switch the optical path from the first optical path division state to the second optical path division state (# 220). From the arrangement for guiding the light beam of the photographing lens 102 to the viewfinder optical system 114 and the focus detection means 107 side described in FIG. 7-1) by this operation, the photographing lens described in FIG. 7-2). The optical path is switched to an arrangement for guiding the light beam 102 to the focal length means 107, the third photometry means 133, and the image sensor 109.

  If the display mode is not changed in step # 217, the current optical path division state is maintained, and the process proceeds to step # 221.

  In step # 219, when the exposure state is appropriate and the second optical path division state in which live view display is possible in step # 220, the light that has entered the image sensor 109 via the photographing lens 102 is The AD conversion means 120 converts the digital signal into a digital signal, and the imaging processing means 121 performs various corrections of pixel information, conversion of the RBG signal into a YC signal, white balance processing, gamma correction processing, signal interpolation processing, and the like. The image data is resized to the display size by 124 and is displayed on the display means 110, so-called live view display is performed (# 220).

  During the live view display period, the focus detection unit 107 (second photometry unit 132), the third photometry unit 133, the fourth photometry unit 134, or the fifth photometry unit 135 performs actual photometry ( # 222), image surface photometry is performed using the image information imaged on the image sensor 109 (# 222).

  Then, the photometric information obtained by the focus detecting means 107 (second photometric means 132), the third photometric means 133, the fourth photometric means 134, or the fifth photometric means 135 is compared with the photometric information obtained by the image sensor 109 (# 223). ). In step # 223, when the difference is smaller than the predetermined value, exposure control is performed by the exposure control means 126 based on the photometric information of the imaging surface photometry obtained by calculating the photometric information from the actual image information on the assumption that there is not much luminance change. (# 224).

  On the other hand, if the difference is larger than the predetermined value in step # 223, there is a large luminance change or scene change during live view display, and the focus detection means 107 (second photometry means 132) or the third The photometry by the photometry means 133, the fourth photometry means 134, or the fifth photometry means 135 responded instantaneously, but in the case of the imaging surface photometry by the image sensor 109, the information of the previous frame remains or the signal is Assuming that there is a difference in the photometric information depending on whether the measurement is out of the dynamic range and cannot be performed correctly, the focus detection means 107 (second photometry means 132), the third photometry means 133, the fourth photometry means 134, or the fifth photometry is performed. Based on the photometric information obtained by the means 135, the exposure control means 126 performs exposure control (# 225).

  Then, it is determined whether or not the release sw 116 has been fully pressed (# 226). If it is determined that the release sw has not been fully pressed, the process goes to step # 227 to determine whether or not the live view display has ended (# 227). .

  If it is determined in step # 227 that the live view display is continued, the process returns to step # 220, and thereafter the same processing is repeated.

  When it is determined in step # 227 that the live view display is finished, the series of operations is finished.

  If it is determined in step # 226 that release sw has been fully pressed, processing is performed in accordance with the type of shooting mode set in advance (# 229).

  That is, if the shooting mode is set to moving image shooting in step # 229, the process proceeds to step # 230, and the focus detection means 107 (second photometry means 132) or the second photometry means 132 is used to quickly confirm / control the photometry state. Actual photometry is performed by the third photometry unit 133, the fourth photometry unit 134, or the fifth photometry unit 135 (# 230), and imaging surface photometry is performed using the image information imaged on the image sensor 109 (# 230). # 231).

  Then, the photometric information obtained by the focus detecting means 107 (second photometric means 132), the third photometric means 133, the fourth photometric means 134, or the fifth photometric means 135 is compared with the photometric information obtained by the image sensor 109 (# 232). ). In step # 232, if the difference is smaller than the predetermined value, exposure control is performed by the exposure control means 126 based on the photometric information of the imaging surface photometry obtained by calculating the photometric information from the actual image information on the assumption that there is not much luminance change. (# 233).

  On the other hand, if it is determined in step # 232 that the difference is larger than the predetermined value, there is a large luminance change or scene change during moving image shooting, and the focus detection means 107 (second photometry means 132) or In the photometry by the third photometry unit 133, the fourth photometry unit 134, or the fifth photometry unit 135, an instantaneous reaction was made, but in the case of the imaging surface photometry by the imaging device 109, the information of the previous frame remains as it is. Alternatively, if the signal is out of the dynamic range and cannot be measured correctly, a difference occurs in the photometric information. Therefore, the focus detector 107 (second photometer 132), the third photometer 133, the fourth photometer 134, or the first photometer Exposure control is performed by the exposure control means 126 based on the photometry information obtained by the five photometry means 135 (# 234).

  When the proper exposure state is obtained in step # 233 and step # 234, moving image shooting and storage thereof are performed (# 235).

  Then, it is determined whether or not the moving image shooting is finished (# 236). If it is determined in step # 236 that movie shooting is to be continued, the process goes to step # 230, and thereafter the same processing is repeated.

  If it is determined in step # 236 that video shooting has ended, the process proceeds to step # 237 to determine whether to end the live view display (# 237). If it is determined to continue the live view display, Returning to step # 220, the video shooting is stopped and the live view display mode is continued. If it is determined that the live view display is ended, the series of operations is ended.

  If it is determined in step # 229 that the shooting mode is the high-speed still image shooting mode, the process proceeds to step # 238, and the input means 125 performs the photometry / exposure control operation and various shooting preparation operations before shooting. It is detected whether the release sw 116 is fully pressed (# 238). If it is determined in step # 238 that the release sw has not been fully pressed, the process returns to step # 238, and the operation is repeated thereafter (standby).

  If it is determined in step # 238 that the release sw 116 has been fully pressed, known still image shooting / recording is performed with the optical path division state maintained in the second optical path division state (# 239). As a result, high-speed still image shooting is performed in which the time lag from when the release sw is fully pressed to when it is shot is greatly reduced.

  Thereafter, the process proceeds to step # 237 to determine whether to end the live view display (# 237). If it is determined to continue the live view display, the process returns to step # 220 to continue the live view display. When it is determined that the live view display is finished, the series of operations is finished.

  If it is determined in step # 229 that the shooting mode is a high-accuracy still image shooting mode, the process proceeds to step # 240, and imaging surface photometry that is most faithful to the captured image for calculating photometric information from actual imaging information is performed (# 240), exposure control is performed by the exposure control means 126 on the basis of the photometric information by the imaging surface photometry in step # 240 (# 241). Then, various other shooting preparation operations are performed (# 242).

  Next, the input means 125 detects whether or not the release sw 116 is fully pressed (# 243). If the release sw is not fully pressed, the process returns to step # 243 and waits until the release sw is fully pressed.

  If it is determined in step # 243 that the release sw has been fully pressed, high-precision still image shooting is performed from the state of the live view display mode. That is, first, the control unit 123 controls the optical path switching unit (not shown) to switch the optical path from the second optical path division state to the third optical path division state (# 244). FIG. 7-3) illustrates the arrangement in which the light beam of the photographing lens 102 described in FIG. 7-2) is guided to the focus detection unit 107 side, the third photometry unit, and the image sensor 109 side by this operation. The optical path is switched to an arrangement in which the light flux of the photographing lens 102 is directly guided to the image sensor 109.

  Then, the light beam directly from the photographing lens 102 is opened by the shutter mechanism 108 for only the shutter time determined in step # 240 without passing through the main mirror, and the still image is photographed. A known still image shooting / recording operation is performed such that the converted light is AD-converted, and appropriate processing is performed by the imaging processing unit 121 and the resulting image information is stored in the storage unit 122 (# 245).

  Then, the optical path switching means (not shown) is controlled again to switch the optical path from the third optical path splitting state to the second optical path splitting state (# 246). By this operation, from the arrangement that directly guides the light beam of the photographing lens 102 to the image sensor 109 described in FIG. 7-3), focus detection of the light beam of the photographing lens 102 described in FIG. 7-2) is performed. The optical path is switched to the arrangement leading to the means 107 side, the third photometry means and the image sensor 109 side.

  Thereafter, the process proceeds to step # 237 to determine whether to end the live view display (# 237). If it is determined to continue the live view display, the process returns to step # 220 to continue the live view display. When it is determined that the live view display is finished, the series of operations is finished.

  As described above, according to the present invention, exposure control is performed on the basis of imaging surface photometry information during live view display image / video shooting, so that it is possible to obtain appropriate photometry information with higher accuracy, Even when the mode is changed or when there is a sudden change in brightness due to composition / scene change, exposure control is performed based on the photometry information of the dedicated photometry means. It becomes possible.

  In another embodiment of the present invention, the photometric means during live view or action shooting is “focus detection means 107 (second photometric means 132), third photometric means 133, fourth photometric means 134, or Although expressed as “fifth photometric means 135”, the present invention does not require all of them. Even if it is composed of only one of the plurality of photometric means and is used alternatively, the same effect can be obtained. Further, it is configured by any one of a plurality of photometric means, and the same effect can be obtained by performing averaging of the photometric information, weighting, and other related processes.

  Further, in the present invention, during live view display or movie shooting, exposure control is performed using information on either exposure control by imaging surface photometry or exposure control by photometry means. Depending on the situation, the two types of metering information can be mixed to change the weighting, or each metering information can be mixed and the weighting can be changed over time after the luminance difference has occurred. A more effective effect can be obtained by adjusting (adjustment that exposure information changes rapidly or exposure information does not change easily).

  FIG. 10 is a control image diagram based on a difference in photometric output between the imaging surface photometry and the photometric means of the present invention.

  In FIG. 10, the horizontal axis represents the passage of time, and the vertical axis represents the photometric output difference between the imaging surface photometry and the photometric means. The vertical axis indicates the dynamic range of the image sensor 109. The maximum luminance and the minimum luminance that can guarantee linearity are indicated by solid lines as D and -D, and D / 4, 3D / 4, -D / 4, -3D / 4 is indicated by a one-point sand line, and D / 2 and -D / 2 are indicated by a dotted line.

  In FIG. 9, these controls are performed from step # 107 to step # 114 in the flowchart of FIG. 3, from step # 117 to step # 123, and from step # 221 to step # 228 in the flowchart of FIG. 9, step # of FIG. The control image in the operation | movement in step # 236 from 230 is shown.

  First, at time t0, the difference between the photometry output of the imaging surface photometry and the photometry means is within ± 1/4 although there is a slight difference. At this time, exposure control is performed using information on the imaging surface photometry.

  At time t1, due to a scene change or the like, the photometric output difference between the photometric surface photometry and the photometry by the photometric means becomes ΔE1, which exceeds the dynamic range D of the image sensor 109. At this time, exposure control is performed using information of the photometric means.

  After that, the exposure amount on the image sensor 109 side becomes appropriate by exposure control and has become 3D / 4 or less at time t2, so by the imaging surface photometry and photometry means until time t3 when it becomes D / 4 or less. Complex exposure control such as averaging processing or weighting processing is performed based on information on photometry, and the difference in photometric output between the imaging surface photometry and the photometry means becomes D / 4 or less after time t3. Exposure control is performed by photometric surface photometry that stably matches the image information.

  From time t4 to time t5, the difference between the photometric output of the imaging surface photometry and the photometric means changes to ΔE2, and since this photometric output difference is within ± 1/4, although there is a slight luminance change, Exposure control is performed using the information.

  As described above, according to the present invention, imaging surface photometry and photometry by photometry means are selectively or combinedly used with reference to the dynamic range of the image sensor, so that it is possible to change scenes while performing stable exposure control. Rapid exposure control is possible for sudden changes in brightness.

  In addition, this invention is not limited to the said Example. For example, the photometric surface photometry or photometry by photometric means can be made variable without changing to 0, ± D / 4, ± D / 2, ± 3D / 4, ± D, or changed according to the characteristics of the image sensor. The same effect can be obtained.

  Further, the determination level may be changed according to the size of the photometry area of the photometry by the imaging surface photometry and the photometry means, or may be changed according to the absolute value of the photometry output by the imaging surface photometry or the photometry means. Similar effects can be obtained.

  The same effect can be obtained even if the photometric output of the photometric means is selectively or combinedly used in accordance with the ratio of the number of pixels exceeding the dynamic range in the photometric area of the imaging surface photometry.

  FIG. 11 is another control image diagram according to the difference in photometric output between the imaging surface photometry and the photometric means of the present invention.

  In FIG. 11, the horizontal axis represents the passage of time, and the vertical axis represents the photometric output difference between the imaging surface photometry and the photometry means. The vertical axis indicates the dynamic range of the image sensor 109, and the maximum luminance and the minimum luminance that can guarantee the linearity are indicated by solid lines as 1 and -1, and D / 4, 3D / 4, -D / 4, -3D / 4 is indicated by a one-point sand line, and D / 2 and -D / 2 are indicated by a dotted line.

  In FIG. 9, these controls are performed from step # 107 to step # 114 in the flowchart of FIG. 3, from step # 117 to step # 123, and from step # 221 to step # 228 in the flowchart of FIG. 9, step # of FIG. The control image in the operation | movement in step # 236 from 230 is shown.

  For example, when performing live view display or moving image shooting of an image containing a light source that periodically flashes, light intensity accumulation is performed as imaging surface photometry, so instantaneous and local large luminance changes are averaged. However, when the photocurrent output is output as it is by only compression / decompression processing as photometry means, the large luminance change may be output as it is.

  As shown in FIG. 11, ΔE1, ΔE2, ΔE3, and ΔE4 are generated as photometric output differences by the imaging surface photometry or the photometry means, and these are all instantaneous luminance changes within a predetermined time ΔT1. Therefore, exposure control is performed on the basis of photometric information obtained by imaging surface photometry without using the photometric output from the photometric means that outputs them.

  In the same figure, ΔE5 occurs as a photometric output difference between the imaging surface photometry or the photometry means, but at this time, since it exceeds the predetermined time ΔT1, imaging surface photometry is performed from that time as a continuous luminance change such as a scene change. The exposure control by is switched to the exposure control by the photometry means. Thereafter, the exposure control by the photometry means is switched to the exposure control by the imaging face photometry from the time when the photometric output difference by the imaging surface photometry or photometry means becomes 3D / 4 or less.

  As described above, according to the present invention, it is possible to perform stable exposure control without changing the exposure control of the entire screen due to instantaneous light or flashing light during live view display or movie shooting, and it is also possible to change scenes. Thus, when the overall brightness change continues, exposure control can be performed quickly.

  In addition, this invention is not limited to the said Example. For example, the same effect can be obtained even if a filter unit is provided in the photometric output by the photometric unit and a process for removing high-frequency components such as blinking of luminance is performed.

  Further, the same effect can be obtained even if the photometric information is kept as it is and the time delay for performing the mechanical operation at the time of exposure control is used so as not to react to the instantaneous luminance change.

Sectional drawing of the digital single-lens reflex camera showing the 1st Example of this invention 1 is a block diagram showing an electrical configuration of a digital single-lens reflex camera representing a first embodiment of the present invention. The flowchart showing the first embodiment of the present invention. Sectional drawing of the digital single-lens reflex camera showing the 2nd Example of this invention Operational diagram of a focus detection device representing a second embodiment of the present invention Fig. 4 is a conceptual diagram of photometric means representing the second embodiment of the present invention. The figure showing the positional relationship of the state of each optical path division | segmentation showing the 2nd Example of this invention The block diagram which shows the electrical constitution of the digital single-lens reflex camera showing the 2nd Example of this invention Flowchart showing the second embodiment of the present invention. Control image diagram of the embodiment of the present invention Another control image diagram of the embodiment of the present invention Flowchart showing the second embodiment of the present invention.

DESCRIPTION OF SYMBOLS 101 Camera main body 102 Imaging lens 103 Imaging optical system 104 Aperture mechanism 105 Main mirror 106 Sub mirror 107 Focus detection means 108 Shutter mechanism 109 Imaging element 110 Display means 111 Focusing screen 112 Pentaprism 113 Eyepiece lens 114 Viewfinder optical system 115 Main sw
116 Release sw
117 finder mode switching sw
120 AD conversion means 121 Imaging system processing means 122 Storage means 123 Control means 124 Reproduction means 125 Input means 131 First photometry means 132 Second photometry means 133 Third photometry means 134 Fourth photometry means 135 Fifth photometry means

Claims (16)

A photographic lens, an image sensor for capturing an object image by the photographic lens, display means for displaying image data from the image sensor, and photometric means different from the image sensor for measuring the brightness of the object image; Have
When performing live view display by providing a first metering mode for metering the brightness of an object image from image data of the image sensor and a second metering mode for metering using a metering means, A camera system characterized in that information on a photometric mode and a second photometric mode is used selectively or in combination. A photographic lens, an image sensor for capturing an object image by the photographic lens, a recording unit for recording image data, and a photometric unit different from the image sensor for measuring the brightness of the object image;
When shooting a movie by providing a first metering mode for metering the brightness of an object image from image data of the image sensor and a second metering mode for metering using a metering means, the first metering is performed. A camera system characterized in that information on the mode and the second photometry mode is used selectively or in combination.   During live view display or movie shooting, when the power is turned on, or when switching to the live view display mode and movie shooting mode, the metering operation is first performed in the second metering mode by the metering means, and then the image sensor is The camera system according to claim 1, wherein the photometry operation is performed according to the first photometry mode used.   Furthermore, it has exposure control means that controls the appropriate exposure by changing the aperture, shutter speed, and ISO sensitivity based on photometric information, and is always or intermittently used during live view display or movie shooting by the image sensor and photometric means. The metering operation is performed in the first / second metering mode, and usually the exposure control operation is performed by the exposure control unit using the metering information in the first metering mode, and the metering information in the second metering mode is previously stored. 3. The exposure control operation according to claim 1, wherein the exposure control operation is performed by the exposure control unit using photometry information in the second photometry mode when the change is greater than a predetermined value. 4. Camera system.   2. When switching to the live view display mode and the moving image shooting mode, the photometry operation is performed in the second photometry mode by the photometry means, and then the live view display mode and the moving image shooting mode are switched. Item 3. The camera system according to Item 2. An imaging lens, an optical path dividing unit that divides an optical path from the imaging lens, an imaging device for imaging an object image by the imaging lens, and an object image by the imaging lens formed through the optical path dividing unit are observed. An optical viewfinder, a first photometric unit that measures the brightness of the object image, an exposure control unit that controls the aperture, shutter speed, and ISO sensitivity based on the photometric information, and controls the exposure to an appropriate amount. Focus detection means for detecting the imaging state of the lens, and display means for displaying the object image formed on the image sensor on a display body represented by an electronic viewfinder or a back monitor,
The optical path splitting means can selectively take the first optical path split state, the second optical path split state, and the third optical path split state, and is in the first optical path split state. The optical path from the photographic lens is divided into the optical viewfinder and the first photometry means / focus detection means, and in the second optical path division state, the optical path from the photographic lens is divided into the imaging element and the focus. Divided into detection means, and in the third optical path division state, the optical path division means is configured to be retracted from the photographing lens and the optical path of the imaging element to the position where the imaging lens is directly imaged on the imaging element. In the camera system,
In the first optical path division state, the exposure control operation is performed based on the photometric information of the first photometric means, and in the second optical path division state, the photometric information obtained from the focus detection means and the imaging element Exposure control operation is performed by using photometric information obtained from pixel data selectively or in combination, and exposure is performed based on photometric information obtained from pixel data of the image sensor in the third optical path division state. A camera system characterized by performing a control operation.   The camera system according to claim 6, wherein the photometric information by the focus detection unit is calculated based on information associated with a distance measuring operation.   7. The camera system according to claim 6, wherein the photometric information by the focus detection unit is calculated by using a second photometry sensor different from the distance measurement sensor in the focus detection unit. . Furthermore, it has a third photometric means,
The optical path splitting means can selectively take the first optical path split state, the second optical path split state, and the third optical path split state, and is in the first optical path split state. The optical path from the photographic lens is divided into the optical viewfinder, the photometry means, and the focus detection means, and in the second optical path division state, the optical path from the photographic lens is divided into the imaging element and the third photometry. And in the third optical path split state, the optical path splitting means is retracted from the optical path of the photographic lens and the image sensor to the position where the image is directly imaged on the image sensor. In the camera system configured in
In the first optical path division state, the exposure control operation is performed based on the photometric information of the first photometry means, and in the second optical path division state, the photometry information of the third photometry means and the pixels of the image sensor Exposure control operation is performed by using photometric information obtained from data selectively or in combination, and exposure is performed based on photometric information obtained from pixel data of the image sensor in the third optical path division state. The camera system according to claim 6, wherein a control operation is performed. An imaging lens, an optical path dividing unit that divides an optical path from the imaging lens, an imaging device for imaging an object image by the imaging lens, and an object image by the imaging lens formed through the optical path dividing unit are observed. An optical viewfinder, a first photometric unit that measures the brightness of the object image, an exposure control unit that controls the aperture, shutter speed, and ISO sensitivity based on the photometric information, and controls the exposure to an appropriate amount. A focus detection means for detecting the imaging state of the lens, a fourth photometry means for measuring the brightness of the external light and controlling the light emission amount of the strobe by measuring the amount of light reflected from the shutter or the image sensor screen; Display means for displaying an object image formed on the image sensor on a display body represented by an electronic viewfinder or a rear monitor;
The optical path splitting means can selectively take the first optical path split state, the second optical path split state, and the third optical path split state, and is in the first optical path split state. The optical path from the photographic lens is divided into the optical viewfinder and the first photometry means / focus detection means. In the second optical path division state, the optical path from the photographic lens is divided into the imaging element and the focus. Dividing into detection means, and in the third optical path division state, the optical path division means is configured to be retracted from the optical path of the photographic lens and the image sensor to the position where the image is directly imaged from the photographic lens. In the camera system,
In the first optical path division state, the exposure control operation is performed based on the photometric information of the first photometry means, and in the second and third optical path division states, the photometry information of the fourth photometry means and the imaging A camera system characterized in that an exposure control operation is performed by using photometric information obtained from pixel data of an element selectively or in combination. An imaging lens, an optical path dividing unit that divides an optical path from the imaging lens, an imaging device for imaging an object image by the imaging lens, and an object image by the imaging lens formed through the optical path dividing unit are observed. An optical viewfinder, a first photometric unit that measures the brightness of the object image, an exposure control unit that controls the aperture, shutter speed, and ISO sensitivity based on the photometric information, and controls the exposure to an appropriate amount. A focus detection means for detecting the image formation state of the lens, a fifth photometry means for measuring the brightness of the object image without going through the photographing lens, and an object image formed on the image sensor on the electronic viewfinder or rear surface. Display means for displaying on a display represented by a monitor,
The optical path splitting means can selectively take the first optical path split state, the second optical path split state, and the third optical path split state, and is in the first optical path split state. The optical path from the photographic lens is divided into the optical viewfinder and the photometric means / focus detection means, and in the second optical path division state, the optical path from the photographic lens is divided into the imaging element and the focus detection means. In the camera system configured to divide and retract from the optical path of the imaging lens and the imaging element from the imaging lens to the position where the optical path dividing means is directly imaged on the imaging element in the third optical path division state ,
In the first optical path division state, the exposure control operation is performed based on the photometric information of the first photometric means, and in the second and third optical path division states, the photometric information of the fifth photometric means and the imaging A camera system characterized in that an exposure control operation is performed by using photometric information obtained from pixel data of an element selectively or in combination.   When live view display or movie shooting, when the power is turned on, or when switching to the live view display mode and movie shooting mode, first, the second photometry means, the third photometry means, the fourth photometry means or the first The camera system according to claim 6, wherein a photometric operation is performed by five photometric means, and a photometric operation using an image sensor is then performed.   During live view display or movie shooting, photometry is performed by the image sensor and the second photometry means, the third photometry means, the fourth photometry means, or the fifth photometry means at all times or intermittently. Exposure control operation is performed by the exposure control means using the photometric information used, and photometric information by the second photometric means, the third photometric means, the fourth photometric means, or the fifth photometric means is predetermined. When the exposure control operation is performed by the exposure control means using the photometry information obtained by the second photometry means, the third photometry means, the fourth photometry means, or the fifth photometry means. The camera system according to claim 6, wherein the camera system is performed.   When the first optical path splitting state is switched to the second optical path splitting state or the third optical path splitting state, first, the first photometric means performs the photometric operation in the first optical path splitting state. The camera system according to any one of claims 6 to 11, wherein an exposure control operation is performed by the exposure control means, and then a switching operation is performed to the second optical path division state or the third optical path division state. .   If the output difference between the photometric information measured by the imaging surface metering and the photometric information by the photometric means is different in live view mode or movie shooting, the photometric information by the imaging surface photometry and the photometric information by the photometric means are selectively selected according to the output difference. Alternatively, the camera system according to any one of claims 1 to 14, wherein the camera system is used in combination.   When live view mode or movie shooting, if the output difference between metering information by imaging surface metering and metering information by metering means is different, depending on the time information that the output difference is above a predetermined level, by imaging surface metering 15. The camera system according to claim 1, wherein the photometric information and the photometric information by the photometric means are selectively or combinedly used.