GB690309A - Improvements in optical viewfinders - Google Patents

Improvements in optical viewfinders

Info

Publication number
GB690309A
GB690309A GB1368651A GB1368651A GB690309A GB 690309 A GB690309 A GB 690309A GB 1368651 A GB1368651 A GB 1368651A GB 1368651 A GB1368651 A GB 1368651A GB 690309 A GB690309 A GB 690309A
Authority
GB
United Kingdom
Prior art keywords
objective
diaphragm
image
eyepiece
rectangle
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
GB1368651A
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 GB1368651A priority Critical patent/GB690309A/en
Publication of GB690309A publication Critical patent/GB690309A/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

Landscapes

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

Abstract

690,309. Photographic-viewfinders. ETABLISSEMENTS EMEL. June 29, 1949, No. 13686/51. Divided out of 690,278. Classes 97 (i) and 98 (i). A viewfinder, the field of which can be adjusted according to the focal length of the camera objective to be used comprises an objective 1 forming a real inverted image in the plane of an adjustable diaphragm 5 viewed by a system comprising an objective 2 forming a real image of the image formed by the objective 1 viewed through an eyepiece 3, the objective 2 and eyepiece 3 being adjustable relative to the lens 1 in accordance with the adjustments of the diaphragm 5 so that the image 41 of the latter formed by the objective 2 is of constant size whatever the size of the diaphragm 5. The diaphragm 5 may consist of two L-shaped members arranged to form a rectangle and movable through equal distances along the diagonal of the rectangle. Specification 690,278 is referred to.
GB1368651A 1949-06-29 1949-06-29 Improvements in optical viewfinders Expired GB690309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1368651A GB690309A (en) 1949-06-29 1949-06-29 Improvements in optical viewfinders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1368651A GB690309A (en) 1949-06-29 1949-06-29 Improvements in optical viewfinders

Publications (1)

Publication Number Publication Date
GB690309A true GB690309A (en) 1953-04-15

Family

ID=10027563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1368651A Expired GB690309A (en) 1949-06-29 1949-06-29 Improvements in optical viewfinders

Country Status (1)

Country Link
GB (1) GB690309A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164470A (en) * 1984-09-14 1986-03-19 Michael Rodney Browning Iris device having linearly movable blades
FR2658312A1 (en) * 1990-02-14 1991-08-16 Asahi Optical Co Ltd SENSOR WITH REAL IMAGE, PARTICULARLY FOR PHOTOGRAPHIC APPARATUS.
GB2272978A (en) * 1990-03-22 1994-06-01 Asahi Optical Co Ltd Zoom finder and camera having same
US5345285A (en) * 1990-03-22 1994-09-06 Asahi Kogaku Kogyo Kabushiki Kaisha View finder and camera having same
WO2008017292A1 (en) 2006-08-08 2008-02-14 Leica Camera Ag Telescope with variable magnification

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164470A (en) * 1984-09-14 1986-03-19 Michael Rodney Browning Iris device having linearly movable blades
FR2658312A1 (en) * 1990-02-14 1991-08-16 Asahi Optical Co Ltd SENSOR WITH REAL IMAGE, PARTICULARLY FOR PHOTOGRAPHIC APPARATUS.
GB2241082A (en) * 1990-02-14 1991-08-21 Asahi Optical Co Ltd Real Image type finder
GB2241082B (en) * 1990-02-14 1994-05-11 Asahi Optical Co Ltd Real image type finder
US5376984A (en) * 1990-02-14 1994-12-27 Asahi Kogaku Kogyo Kabushiki Kaisha Real image type finder
GB2272978A (en) * 1990-03-22 1994-06-01 Asahi Optical Co Ltd Zoom finder and camera having same
US5345285A (en) * 1990-03-22 1994-09-06 Asahi Kogaku Kogyo Kabushiki Kaisha View finder and camera having same
GB2244144B (en) * 1990-03-22 1994-09-28 Asahi Optical Co Ltd Camera having a view finder
GB2272978B (en) * 1990-03-22 1994-09-28 Asahi Optical Co Ltd Zoom lens camera
WO2008017292A1 (en) 2006-08-08 2008-02-14 Leica Camera Ag Telescope with variable magnification
US7684115B2 (en) 2006-08-08 2010-03-23 Leica Camera Ag Telescope with variable magnification

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