JP2002236314A - Camera aperture display - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To enable accurate display of the F value of a lens attached to a camera, while displaying the F value to be displayed with an appropriate resolution. To provide an F-number display device. SOLUTION: A display aperture value storage means (display memory) storing a display aperture value that changes the aperture value of a lens 2 in 1/2 steps and a display aperture value that changes in 1/8 steps.
8, aperture value detection means 13 and 7 for detecting the currently set aperture value of the lens 2, and a corresponding display aperture value from the display aperture value storage means 8 based on the detected aperture value,
And a display control means (CPU) 5 for displaying the selected display aperture value on the display 16. Display control means 5
Selects a 1 / 8-step display aperture value when it is determined that the set aperture value of the lens 2 is an open aperture value,
When it is determined that the aperture value is other than the above, a 1/2 step display aperture value is selected and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having interchangeable lenses, and more particularly to a camera F-number display device capable of displaying an aperture value (F-number) of a lens on a camera body.

[0002]

2. Description of the Related Art An interchangeable lens camera is provided with an F-number display device for displaying an F-number of a mounted lens on a camera body side. This F-number display device transmits the open F-number information normally stored in a lens ROM provided in the lens and the F-number setting information set by a lens aperture setting ring to the camera body side, An F-number display is performed on a display such as a liquid crystal display provided on the camera body side based on the information. In the case of a zoom lens, the open F-number is changed by zooming. In this case, the open F-number corresponding to the set focal length is transmitted from the lens ROM to the camera body and the F-number is displayed. The display is made on the device.

A conventional F-number display device provided in a camera body has a structure in which an F-number is displayed as a digital numerical value. When displaying this digital numerical value, the F-number is displayed with a certain display resolution. It is configured to be. For example, when the F value display is a one-step display,
"1.0, 1.4, 2.0, 2.8, 4,...", And when a 1 / 2-step display is used to display a finer F value, "1.0, 1.2, 1.4, 1.7, 2.0, 2.4, 2.8"
, 3.4, 4, ... ". As described above, if the display resolution is made finer, the F-number can be displayed more accurately. However, the actual photographer only needs to know the approximate F-number and rarely needs a fine F-number. Therefore, usually 1/2
The display resolution is set to about the step or about 1/3 step.

[0004]

However, it is important for the photographer to recognize the open F value of the lens mounted on the camera, and particularly to recognize the open F value that is changed by zooming in a zoom lens. It is necessary to prevent underexposure shooting beforehand. For this reason, accurate display is required for the open F value. However, as described above, in the F value display device set to a display resolution of 1/2 step or 1/3 step, the open F value of the lens is used. Does not match the F value on the display resolution, accurate display may not be performed. For example, in the case of a lens having a nominal open F-number of “1.9”, the F-number display device displays “1.7” (１ ／).
This is displayed as a display open F value of "1.8" (for 1/3 step display) or "1.8" (for 1/3 step display). Such a problem is the same when the open F-number changes with zooming in the zoom lens or when the F-number changes with the operation of the aperture setting ring of the lens. It will happen. Further, in the lens having the nominal open F value of F “1.9”, a case where the displayed F value is smaller than “2.0” may not be displayed, the user feels that the open F value cannot be set, and I'm worried about it.

In order to eliminate or reduce such an error between the nominal open F value and the display open F value, the display resolution of the F value display device may be reduced. For example, it is conceivable to set it to about 1/8 step. If the display resolution is reduced to this extent, it is possible to set the display open F value to "1.9" even for the above-mentioned nominal open F value "1.9". However, when the fine F-number is set in such a manner, the digital F-number as the display F-number is displayed on the F-number display device in accordance with the change of the nominal F-number when the zooming or the aperture setting ring is operated in an area other than the open F-number. Will change rapidly,
In this case, as described above, the display which is originally unnecessary is performed, and the change of the F value becomes troublesome for the photographer.

SUMMARY OF THE INVENTION An object of the present invention is to provide an F-number display device capable of displaying an open F-number accurately and displaying an F-number to be displayed with an appropriate resolution. is there.

[0007]

An F-number display device for a camera according to the present invention is a first-step display aperture value for displaying an aperture value of a lens mounted on the camera as an aperture value that changes in a first step. A display aperture value storing means for storing a second step display aperture value which changes in a second step having a finer resolution than the first step, and a current set aperture value of the lens is detected. Aperture value detection means, and display control means for selecting a corresponding display aperture value from the display aperture value storage means based on the detected aperture value, and displaying the selected display aperture value on a display, When the display control means determines that the aperture value of the lens is the open aperture value of the lens,
A step display aperture value is selected, and when it is determined that the aperture value is other than the open aperture value of the lens, the first step display aperture value is selected.

For example, a preferred embodiment of the present invention includes:
The first step display aperture value is 1/2 or 1/3.
The second step display aperture value is a display aperture value with a fine resolution of 1/8 step or more. Further, in the present invention, when a rear converter is mounted on the lens, it is preferable that the aperture value detecting means corrects the aperture value of the lens by the rear converter. When the lens is configured as a zoom lens, the display control means
It is preferable to select the second step display aperture value when displaying the open aperture values of the short focal point end point and the long focal point end point of the zoom lens.

According to the F-number display device of the present invention, when displaying the open F-number of the lens, the second display having a fine display resolution is used.
Select the step display aperture value and display the F value, then open F
When an F value other than the value is displayed, the first step display aperture value having a lower display resolution than that value can be selected to perform the F value display. This makes it possible to accurately display the open F value that deviates from the display value at the resolution of the first step display aperture value. On the other hand, opening F
In the display of the F value other than the value, the F value is displayed at a display resolution sufficient for actual photographing, and the display does not change rapidly and the photographer does not feel annoying. If the open F value when the rear converter is attached deviates from the display value at the resolution of the first step display aperture value, the open F value on the short focal length side and the long focal length side of the zoom lens is further reduced. In each of the cases where the resolution of the first step display aperture value deviates from the display value, it is possible to display an accurate F value, while the F value display in a state in which the F value display changes rapidly. Be avoided.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embodiment in which the F-number display device of the present invention is applied to an interchangeable lens single-lens reflex camera. The lens 2 is detachable from the camera body 1. In this embodiment, the lens 2
It is assumed that a rear converter 3 (teleconverter) is attached to the rear part of the vehicle. The lens 2 is provided with an aperture setting ring 22 along the peripheral surface of the lens barrel 21. The peripheral surface of the aperture setting ring 22 includes an F-number “1.4” including a nominal open F-number “1.4”. , 2.0, 2.8, 4,... ”, And the photographer sets the F value for the index 23 provided on the lens barrel 21 by rotating the aperture setting ring 22. It is possible. A lens ROM 4 is built in the lens barrel 21.
As will be described later, information on the nominal open F value of the lens 2 and information on the display resolution of the display F value are set in the lens ROM 4, and when the lens 2 is mounted on the camera body 1, the information is stored in the lens ROM 4. Information is transmitted to the camera body 1 side. On the other hand, an aperture linking piece (not shown) is formed integrally with the aperture setting ring 22 so as to transmit a rotational position when the aperture setting ring 22 is operated to the camera body 1 side. . Also, a rear controller ROM 6 is built in the rear converter 3 so that a shift value given to an open F value of the rear converter 3 is transmitted to the camera body 1 side.

The camera body 1 has a finder 1
1, a release button 12, a photometric device 13, a strobe (flash) 14, various switches 15 and the like are provided, and a liquid crystal display device 16 capable of displaying various photographing information such as a shutter speed and an F value is provided. . Further, a CPU 5 for controlling the operation of the entire camera is provided in the camera body 1. Further, a set position of the aperture setting ring, that is, a set position corresponding to the F value set by the aperture setting ring, is detected in conjunction with the aperture linking piece of the lens 2, and the detected set position is input to the CPU 5. An aperture setting ring detection mechanism 7 is provided. As the aperture setting ring detection mechanism 7, for example, an encoder using a code plate and a sliding contact is used.

As described above, information on the nominal open F-number and display resolution from the lens ROM 4 is input to the CPU 5, and information on the shift value is input from the rear computer ROM 6. From the setting ring detection mechanism 7, information on the set F value set by the aperture setting ring of the lens is input. Further, the CPU 5 performs required processing based on the input information of the nominal opening F value, the set F value, and the shift value, and inputs the display resolution obtained by this processing to the liquid crystal display device 16, It is configured to display the current F-number of 2. In this case, the CPU 5 accesses the display memory 8 provided in the camera body 1 and displays the F value based on the display F value table data stored in the display memory 8. As shown in FIG. 2, the display F value table data corresponds to a value calculated based on the Av value,
The F value for displaying in two steps and １ ／ step is stored.

The F-number display operation in the camera having the above configuration will be described. FIG. 3 shows the general flow.
When the lens 2 is mounted on the camera body 1, the lens ROM
4 transmits various information to the camera body side,
, The so-called lens ROM communication is performed (S101). Next, the aperture setting ring detection mechanism 7 of the camera body 1 detects the setting position of the aperture setting ring 22 of the lens, and the detected setting position is input to the CPU 5 (S10).
3). When the photometric switch is turned on by pressing the release button 12, the photometric output of the photometric device (photometric sensor) 13 is input to the CPU 5 (S105), and information of various switches 15 is input to the CPU 5 (S10).
7). Then, the CPU 5 executes the AE (exposure) calculation (S109), and displays the current F value of the lens and the calculated shutter speed on the liquid crystal display device 16 (S111, S113). Further, various kinds of preset information are displayed on the liquid crystal display device 16 (S11).
5). Hereinafter, although the description is omitted, the release button 12
When the release switch is turned on by further pressing of, shooting at the displayed F value and shutter speed is executed.

FIG. 4 shows the flow of the AE operation S109. The sensitivity apex value Svd is calculated from the ISO sensitivity of the film among the information of the various switches input in step S107 of the general flow (S201). Also, the aperture setting ring 22 input in step S103
The apex value Avvrd of the rotational position of the vehicle is calculated (S2
03). Next, in step S101, the apex value Avdmin of the open F value and the apex value Avdmax of the maximum F value (minimum aperture) of the lens 2 attached are calculated from the various information input from the lens ROM 4 (S205). Further, the step S105
The photometric apex value Bvd is calculated from the photometric output of the photometric device input in step (S207). Then, it is determined whether or not flash photography is necessary based on the photometric apex value Bvd (S209). If flash photography is necessary, the current F-number apex value Av is set from the current aperture setting ring setting position Avvrd obtained in step S203.
d is calculated (S211). And the Svd, Bv
Exposure calculation is performed based on d and Avd to calculate an apex value Tvd of a shutter speed in flash photography (S213). If the flash photography is not necessary, the F-number apex value Av is used as in step S211.
d is calculated (S215), and the Bvd, Sv
Exposure calculation is performed based on d and Avd, and steady light (external light)
An apex value Tvd of the shutter speed at is calculated (S217). The F value and the shutter speed set in this way are determined in steps S111 and S11 in the flow of FIG.
In 3, the image is displayed on the liquid crystal display device 16.

Next, the operation of displaying the F value displayed on the liquid crystal display device 16 will be described in detail. First, the information stored in the lens ROM 4 is shown in FIG.
The lens ROM 4 stores information such as the lens type, Avdmin, which is the apex value of the nominal open F value, Avdmax, which is the apex value of the nominal maximum F value, and the serial number of the lens. Further, 1/2 step and 1/8 step are set as the resolution of Avdmin, and the first flag FL1 indicating which of these 1/2 step and 1/8 step is set is set to the Avdmin offset (1). Is stored. Here, the first flag FL1
Is set to 1/8 step when is "1", and set to 1/2 step when the first flag FL1 is "0". The Avdmin offset (1) of the lens ROM 4 indicates whether the offset data of the rear converter with respect to the Avdmin of 1/2 step data is corrected as “positive (plus)” or “negative (minus)”. 2 flag FL2 is stored. Here, the offset data is subtracted when the second flag FL2 is "1", and the offset data is added when the second flag FL2 is "0". The rear converter RO of the rear converter 3
FIG. 5B shows the information stored in M6. The rear control ROM 6 stores the Avdmin rear control shift value together with the lens type.

FIG. 6 shows a flow of the operation of calculating Avdmin and Avdmax in step S205 of the flow of FIG.
Shown in First, it is determined whether a rear converter is mounted (S301). In the camera of the present embodiment, since the rear converter 3 is provided, step S30
1, the rear converter is present, and the Avdmi of the rear converter is read from the rear converter ROM 6 shown in FIG.
The n rear control shift is read out and set as Avdshift (S303). If there is no rear converter, Avdshift is set to "0" (S305).

Next, the first flag FL of the lens ROM 4 is set.
1 is determined (S307). The first flag FL1 is "1"
In the case of, the display is performed in 1/8 steps. When the first flag FL1 is "0", the lens serial number is determined, and the lens type is F1.
When it is determined that the lens is No. 9 (S309),
Avdmin is set to F1.9 (S311). When it is determined from the lens serial number that the lens type is F1.8 (S313), Avdmin is set to F1.8.
1.8 (S315). These F1.9 and F1.8
Each lens is an example of a lens having a unique open F value provided so far. If there is another lens having a unique open F value, the lens is identified from the lens serial number. Is determined, and the open F value set for each is set to Avdmin. When the determination is made from the serial number, Avdmin having a resolution of 1/8 step shown in FIG.
No offset (2) information is needed.

In step S307, 1
When the display in the / 8 step is validated, the second flag FL2 of the lens ROM 4, which is a flag indicating a sign, is determined (S317). When the second flag FL2 is "1", the offset data is subtracted.
Avdmin is a value obtained by subtracting 1/8 step offset data from 1/2 step Avdmin data in the lens ROM, and becomes 1/8 step data (S319). That is, Avdmin = lens ROM 1/2 step Avdmi
n-data-1/8 step offset data When the second flag FL2 is "0", offset data is added, and as a result, Avdmin is added to the 1/2 step Avdmin data of the lens ROM by 1/8 step. A value obtained by adding the offset data is set (S321). That is, Avdmin = lens ROM 1/2 step Avdmi
n data + 1/8 step offset data

Then, the Av obtained in each of the above flows is obtained.
dmin to the Avdshi obtained in step S303.
ft is added to calculate a final Avdmin. Also,
The Avdshift is added to the Avdmax data obtained from the information in the lens ROM 4 to obtain the final Avdshift.
The maximum is calculated (S323). When no rear converter is present, Avdshift is 0, and thus the values of Avdmin and Avdmax are not changed.

As described above, Avdmin and Avdmax
Is calculated, and the F value is displayed in step S111 of the flow in FIG. FIG. 7 shows a flow of the operation of displaying the F value. First, step S21 of the AE operation in FIG.
1, Avd calculated in S215 and step S3 in FIG.
Is compared with Avdmin calculated in step S23 (S40).
1). When Avd is equal to or greater than Avdmin, it is determined that the current aperture of the lens 2 is in the open state, the data to be displayed is Avdmin, and the open F value is displayed (S403). At this time, the first flag F1 is "1" and the display resolution is 1/8 in the determination in step S307.
If it is a step, or if the step S309, S
If it is determined in step 313 that the lens is a lens having a peculiar open F-number such as F1.9 or F1.8, one of the display F-value table data shown in FIG. / 8 step F value is selected (S405, S40)
7).

On the other hand, in step S401, A
When vd is larger than Avdmin, the data to be displayed is set to Avd, and an intermediate F value based on Avd obtained by the AE operation is displayed (S409). At this time, an F value of 1/2 step of the display F value table data stored in the display memory is selected (S411, S411).
S413). In step S405, when the flag F1 indicating the display resolution is not 1/8 step, or when it is determined that the lens 2 is not an F1.9 or F1.8 lens by the determination of the serial number, the same applies. The F value of the 1/2 step of the display F value table data is selected (S411, S413).

As a result, Avdm which is the minimum value of Avd
in, that is, when displaying the open F value, or F1.
When displaying the unique open F value of the lens of 9 or F1.8, the F value is displayed at the display resolution of 1/8 step, and when displaying the F value larger than the open F value , An F-number display of 1/2 step is performed. That is, in the display of the open F value, the F in the subdivided steps is used.
The value can be displayed, and the open F value including the F value which deviates from the display value in the F value display of the display resolution of 1/2 step or 1/3 step, such as F1.9 or F1.8, can be displayed. The value can be displayed accurately. On the other hand, in the display of the F value other than the open F value, since the F value is displayed at a larger display resolution of 1/2 step,
In actual shooting, display is performed with a sufficient display resolution, and the display does not change rapidly and the photographer does not feel bothered.

For example, as can be seen from the F value display table data shown in FIG. 2, in the case of an F1.8 or F1.9 lens, in the case of 1/2 step display, the open F value is determined by which lens. But it is displayed as F1.7 or F2.0,
In the case of 1/8 step display as in the present embodiment, they are displayed as F1.8 and F1.9, respectively, so that the open F value can be displayed accurately. On the other hand, if the display changes from F4.0, which is an intermediate F value, to F5.6,
In the case of 1/8 step, F4.0, F4.2, ..., F5.
The displayed F value changes in 8 steps of 4 and F5.6.
In the case of / 2 step, F4.0, F4.5, F5.6 and 3
The display F value changes in stages. Therefore, the intermediate F value is 1 /
By performing the display in two steps, the photographer does not feel annoying the display change.

Further, the rear converter is mounted as in the above embodiment, and the Av shift value Avd of the rear converter is attached.
FIG. 8 shows a case in which shift is considered. The calculated Av is
The 1 / 8-step calculation data shown in FIG. 2, the F value is a nominal value, the Avmin is an apex display of the calculated Av, the 1/8 step display is a display value corresponding to the calculated Av,
The 1/2 step display is a display value corresponding to the calculated Av. For example, in the case of a lens having a nominal open F value of F1.9, when the rear converter 3 is not mounted, the Avmin is 1.875 and the open F value for 1/8 step display is 1.9, as shown in FIG. The open F value for 1/2 step display is 2.0. When the (× 2) rear converter 3 is attached to this lens, the nominal open F value is F3.8 (1.9 × 2), (Avmin = 3.875) as shown in FIG.
(1.875 + 2)). (+2) is the (× 2) Avdshift of the rear converter. The open F value for display in 1/8 steps is F
The display open F value for 3.8 and 1/2 steps is F4.0. When a (× 1.7) rear converter is mounted as shown in FIG.
(1.9 x 1.7) (Avmin = 3.375 (1.875 + 1.5)
)). (+1.5) is the Avshift of (× 1.7) of the rear converter. For this nominal open F value, the open F value for display in 1/8 steps is F3.2
, 1/2 of the display open F value is F3.5.
Thus, even when the rear converter is used, the open F value can be displayed more accurately.

The present invention is also applicable to a zoom lens. For example, FIG. 9 shows F3.2 to 4.8 / f.
(Focal length: mm) This is an example in which the present invention is applied to a lens having a diameter of 28 to 80. The focal length is f28 at the shortest focus end (S end), ...,
.., F4.0 at the longest focal point end (L end), the nominal open F-numbers are F3.2,.
..., F4.8. Avmin is 3.375,
..., 4.0, ..., 4.5. On the other hand, in the 1/8 step, the open F value for display is F3.2,.
F4.0, ..., F4.8. In the 1/2 step, the open F values for display are F3.5,..., F4.0,
..., F4.5. From this, at the S end and the L end, 1
It can be seen that in the case of the display open F value of / 8 step, an accurate F value that matches the nominal open F value is displayed. Also,
On the other hand, at the intermediate focus, it is found that there is no large difference between the display open F values of １ ／ step and ２ step. Therefore, when applied to a zoom lens, S
At the end and the L end, the display of the open F value is performed in １ ／ steps, and the display of the open F value at the intermediate focus is performed in ２ steps. This allows accurate display of the open F value over the entire focal length of the zoom lens, while
The open F value at the central focus does not change minutely, and the photographer does not feel bothered. Further, the F value on the catalog display generally indicates the F value at the S end and the L end, but there is a merit that the F value can be matched with the F value displayed by the camera.

Here, in the above embodiment, the display of the F value has been described with respect to the example of the resolution of ス テ ッ プ step and the resolution of ８ step, but the display is performed at a resolution other than these steps. It goes without saying that it is possible. Also, the example has been described in which the display aperture value storage means is configured as a display memory for storing the display F value calculated in advance, but the display F value is calculated each time according to the resolution of the step given from the display control means. It is also possible to configure as an arithmetic circuit that performs the operation. Also, the example in which the F value is set by the lens is shown. However, even when the F value is set from the camera body, the F value is calculated from the photometric value (Bv) in the automatic exposure mode.
The same operation is performed even when the value is automatically set.

[0027]

As described above, according to the present invention, when displaying the open F-number of the lens, the display resolution is small.
Select the step display aperture value and display the F value, then open F
When displaying an F value other than the value, the first step display aperture value having a coarser display resolution is selected and the F value is displayed, so that the resolution of the first step display aperture value deviates from the display value. While it is possible to accurately display the open F value, the F value other than the open F value is displayed.
In actual photographing, the F-number display with a sufficient display resolution is performed, and the display does not change rapidly and the photographer does not feel bothered. Further, when the open F value when the rear converter is mounted deviates from the display value at the resolution of the first step display aperture value, further, the open F value of the short focal point end point and the long focal point end point of the zoom lens is further reduced. In each case where the value deviates from the displayed value at the resolution of the first step display aperture value, it is possible to display an accurate F value, while the F value in a state where the F value display changes rapidly. Display is avoided. Further, in general, only the short focal point end point and the long focal point end point of the F-number of the zoom lens are displayed in the catalog notation, so that there is an effect that the display of the camera can match the numerical value indicated in the catalog.

[Brief description of the drawings]

FIG. 1 is a conceptual configuration diagram of a camera including an F-number display device of the present invention.

FIG. 2 is a diagram showing an example of display F value table data stored in a display memory.

FIG. 3 is a general flowchart of an F-number display operation according to the present invention.

FIG. 4 is a flowchart of an AE calculation.

FIG. 5 is a diagram showing information of a lens ROM and a rear computer ROM.

FIG. 6 is a flowchart for calculating an open F value and a maximum F value.

FIG. 7 is a flowchart of an aperture value display.

FIG. 8 is a diagram showing an example of an open F value display when a rear converter is used.

FIG. 9 is a diagram illustrating an example of an open F-number display when a zoom lens is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera body 2 Lens 3 Rear converter 4 Lens ROM 5 CPU 6 Rear control ROM 7 Aperture setting ring detecting mechanism 8 Display memory 11 Viewfinder 12 Release button 13 Photometry device 14 Strobe 15 Various switches 16 Liquid crystal display device 21 Lens tube 22 Aperture setting ring 23 indicators

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Isamu Hirai 2-36-9 Maeno-cho, Itabashi-ku, Tokyo F-term in Asahiko Gaku Kogyo Co., Ltd. 2H102 AA03 AA06 BA12

Claims (8)

[Claims] 1. A first step display aperture value for displaying an aperture value of a lens mounted on a camera as an aperture value that changes in a first step, and a second step aperture value having a finer resolution than the first step. Display aperture value storage means for storing a second step display aperture value changing in steps, respectively;
An aperture value detecting means for detecting a currently set aperture value of the lens, a corresponding display aperture value from the display aperture value storage means based on the detected aperture value, and the selected display aperture value Display control means for displaying on a display, the display control means selects the second step display aperture value when it is determined that the aperture value of the lens is the open aperture value of the lens, An aperture value display device for a camera, wherein the first step display aperture value is selected when it is determined that the aperture value is other than the full aperture value of the above (1). 2. An apparatus according to claim 1, wherein said display aperture value storage means is a display memory for storing each of said display aperture values calculated in advance as a table. . 3. The aperture value detection means compares open aperture data of the lens transmitted from the lens with current aperture data calculated by exposure calculation means provided in the camera. The aperture value display device for a camera according to claim 1 or 2, wherein the aperture value is determined to be an open aperture value when the aperture data is smaller than the open aperture data. 4. The apparatus according to claim 1, wherein said aperture value detecting means corrects the aperture value of said lens by said rear converter when a rear converter is mounted on said lens. An aperture value display device for the camera according to the above. 5. The display control means according to claim 2, wherein said lens is configured as a zoom lens, and said display control means sets said second step display aperture value when displaying each open aperture value at a short focal point end point and a long focal point end point of said zoom lens. The aperture value display device for a camera according to any one of claims 1 to 4, wherein the first step display aperture value is set in the intermediate focus setting. 6. The first step display aperture value is a display aperture value having a resolution of 1/2 or 1/3 step, and the second step display aperture value is a display aperture value having a fine resolution of 1/8 step or more. 2. The method according to claim 1, wherein
An aperture value display device for a camera according to any one of claims 1 to 5. 7. The apparatus according to claim 1, wherein the display is a display for digitally displaying the display aperture value. 8. The display control device according to claim 1, wherein the display control means sets the resolution of the display aperture value based on a serial number of the lens or information corresponding thereto. Aperture value display device for cameras.