GB489125A - Improvements in or relating to finders for photographic cameras - Google Patents

Improvements in or relating to finders for photographic cameras

Info

Publication number
GB489125A
GB489125A GB981037A GB981037A GB489125A GB 489125 A GB489125 A GB 489125A GB 981037 A GB981037 A GB 981037A GB 981037 A GB981037 A GB 981037A GB 489125 A GB489125 A GB 489125A
Authority
GB
United Kingdom
Prior art keywords
objective
image
camera
reflects
lens
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
GB981037A
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.)
Ernst Leitz Wetzlar GmbH
Original Assignee
Ernst Leitz Wetzlar GmbH
Ernst Leitz GmbH
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 Ernst Leitz Wetzlar GmbH, Ernst Leitz GmbH filed Critical Ernst Leitz Wetzlar GmbH
Priority to GB981037A priority Critical patent/GB489125A/en
Publication of GB489125A publication Critical patent/GB489125A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/14—Viewfinders

Abstract

489,125. Photographic view finders; reflex cameras. KILBURN, B. E. D. (Leitz Ges., E.) April 6, 1937, No. 9810. [A Specification was laid open to inspection under Sect. 91 of the Acts, Nov. 22, 1937.] [Class 98 (i)] A direct-vision finder comprises a movable reflex mirror, which reflects the image formed by the camera objective to a viewing system consisting of an eyepiece close to the camera, reflecting surfaces which deflect the rays round a closed figure having two sides intersecting at right-angles, and an objective situated in the part of the ray-path forming the closed figure. The construction shown is adapted to be interposed between the body B and lens B<1> of a camera to convert it to reflex type. A<1> is the movable reflex mirror reflecting the image from the lens B<1> to a ground glass screen C. The rays from this image pass through a collecting lens F to a prism reflector G which reflects them through an objective D to a prism reflector H which in turn reflects them to the eyepiece E. The objective D may be moved to the dotted position, thereby altering the magnification, so that the image may be viewed either as a whole, or in part at increased magnification for sharp focusing.
GB981037A 1937-04-06 1937-04-06 Improvements in or relating to finders for photographic cameras Expired GB489125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB981037A GB489125A (en) 1937-04-06 1937-04-06 Improvements in or relating to finders for photographic cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB981037A GB489125A (en) 1937-04-06 1937-04-06 Improvements in or relating to finders for photographic cameras

Publications (1)

Publication Number Publication Date
GB489125A true GB489125A (en) 1938-07-20

Family

ID=9879212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB981037A Expired GB489125A (en) 1937-04-06 1937-04-06 Improvements in or relating to finders for photographic cameras

Country Status (1)

Country Link
GB (1) GB489125A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746421C (en) * 1938-12-10 1944-08-05 Carl Bueschel Device for reversing the focusing screen image of reflex cameras
US2513861A (en) * 1947-04-29 1950-07-04 Alfred B Harrott Reflex camera having reflecting finder system
US2604832A (en) * 1948-06-09 1952-07-29 Farrand Optical Co Inc Reflex camera optical system, including telephoto lens and telescope finder
US4195922A (en) * 1979-03-22 1980-04-01 Stephen Hajnal Snorkel camera system
GB2251498A (en) * 1990-11-26 1992-07-08 Asahi Optical Co Ltd Dustproof view finder

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746421C (en) * 1938-12-10 1944-08-05 Carl Bueschel Device for reversing the focusing screen image of reflex cameras
US2513861A (en) * 1947-04-29 1950-07-04 Alfred B Harrott Reflex camera having reflecting finder system
US2604832A (en) * 1948-06-09 1952-07-29 Farrand Optical Co Inc Reflex camera optical system, including telephoto lens and telescope finder
US4195922A (en) * 1979-03-22 1980-04-01 Stephen Hajnal Snorkel camera system
GB2251498A (en) * 1990-11-26 1992-07-08 Asahi Optical Co Ltd Dustproof view finder
US5250969A (en) * 1990-11-26 1993-10-05 Asahi Kogaku Kogyo Kabushiki Kaisha Dustproof view finder
GB2251498B (en) * 1990-11-26 1994-04-06 Asahi Optical Co Ltd Dustproof view finder
USRE36018E (en) * 1990-11-26 1998-12-29 Asahi Kogaku Kogyo Kabushiki Kaisha Dustproof view finder

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