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GB690278A - Improvements in optical view finders - Google Patents

Improvements in optical view finders

Info

Publication number
GB690278A
GB690278A GB17233/49A GB1723349A GB690278A GB 690278 A GB690278 A GB 690278A GB 17233/49 A GB17233/49 A GB 17233/49A GB 1723349 A GB1723349 A GB 1723349A GB 690278 A GB690278 A GB 690278A
Authority
GB
United Kingdom
Prior art keywords
image
objective
tube
eyepiece
diaphragm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB17233/49A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMEL ETS
Original Assignee
EMEL ETS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EMEL ETS filed Critical EMEL ETS
Priority to GB17233/49A priority Critical patent/GB690278A/en
Publication of GB690278A publication Critical patent/GB690278A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Viewfinders (AREA)
  • Lenses (AREA)

Abstract

690,278. Photographic-viewfinders. ETABLISSEMENTS EMEL. June 29, 1949, No. 17233/49. Classes 97 (i) and 98 (i). A viewfinder adjustable for use with objectives of different focal lengths comprises an objective 1 forming a real inverted image of the object, an objective 2 forming a real image of this image in the plane of a diaphragm 4 viewed through an eyepiece 3, the objective 2 being movable to vary the magnification of this image, and the eyepiece 3 and diaphragm 4 being simultaneously moved to maintain the latter in the plane of the second image, whereby the image seen is masked by a frame of fixed dimensions, the extent of the image seen in the frame being varied in accordance with the camera lens in use. A collective lens 8 may be placed at the image formed by the objective 1. As shown in Fig. 3, the lenses 1 and 8 are fixed in a tubular body 9 in which slide a tube 10 carrying the objective 2 and a tube 11 carrying the eyepiece 3 and diaphragm 4. The tubes have pin 101, 11<SP>1</SP> respectively, engaging a longitudinal slot 12 in the tube 9 and helical grooves 13, 14, respectively, in a sleeve 15 rotatable on the tube 9 but prevented from moving longitudinally thereof by engagement of a pin 16 on the sleeve with a groove 17 on the tube.
GB17233/49A 1949-06-29 1949-06-29 Improvements in optical view finders Expired GB690278A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB17233/49A GB690278A (en) 1949-06-29 1949-06-29 Improvements in optical view finders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17233/49A GB690278A (en) 1949-06-29 1949-06-29 Improvements in optical view finders

Publications (1)

Publication Number Publication Date
GB690278A true GB690278A (en) 1953-04-15

Family

ID=10091579

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17233/49A Expired GB690278A (en) 1949-06-29 1949-06-29 Improvements in optical view finders

Country Status (1)

Country Link
GB (1) GB690278A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0688439A4 (en) * 1993-03-09 1998-04-08 Benopcon Inc Wide angle binocular system with variable power capability
EP1746451A3 (en) * 2005-07-20 2007-07-11 Swarovski-Optik KG Telescope with wide field of view and large magnification
ES2283199A1 (en) * 2005-10-11 2007-10-16 Fco. Javier Porras Vila Focal length multiplier for telescope, has movable devices, conduction cylinder, and star lights, which cannel the light by multiple flat pipes

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0688439A4 (en) * 1993-03-09 1998-04-08 Benopcon Inc Wide angle binocular system with variable power capability
EP1746451A3 (en) * 2005-07-20 2007-07-11 Swarovski-Optik KG Telescope with wide field of view and large magnification
DE202006020736U1 (en) 2005-07-20 2009-12-03 Swarovski Optik Kg Remote optical device with large field of view and high magnification
US7742228B2 (en) 2005-07-20 2010-06-22 Swarovski-Optik Kg. Far-optical device
US8054544B2 (en) 2005-07-20 2011-11-08 Swarovski-Optik Kg Far-optical device
DE202006021185U1 (en) 2005-07-20 2013-06-06 Swarovski-Optik Kg Remote optical device with large field of view and high magnification
US8786947B2 (en) 2005-07-20 2014-07-22 Swarovski-Optik Kg. Far-optical device
US9529185B2 (en) 2005-07-20 2016-12-27 Swarovski-Optik Kg. Far-optical device
US10620422B2 (en) 2005-07-20 2020-04-14 Swarovski-Optik Kg. Far-optical device
ES2283199A1 (en) * 2005-10-11 2007-10-16 Fco. Javier Porras Vila Focal length multiplier for telescope, has movable devices, conduction cylinder, and star lights, which cannel the light by multiple flat pipes
ES2283199B1 (en) * 2005-10-11 2008-09-16 Fco. Javier Porras Vila FOCAL DISTANCE MULTIPLIER FOR TELESCOPE.

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