GB1010226A - Improvements in or relating to photographic cameras - Google Patents

Improvements in or relating to photographic cameras

Info

Publication number
GB1010226A
GB1010226A GB3758662A GB3758662A GB1010226A GB 1010226 A GB1010226 A GB 1010226A GB 3758662 A GB3758662 A GB 3758662A GB 3758662 A GB3758662 A GB 3758662A GB 1010226 A GB1010226 A GB 1010226A
Authority
GB
United Kingdom
Prior art keywords
lens
focal length
eyepiece
negative
convex
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
GB3758662A
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.)
Rollei Werke Franke und Heidecke GmbH and Co KG
Original Assignee
Rollei Werke Franke und Heidecke GmbH and Co KG
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 Rollei Werke Franke und Heidecke GmbH and Co KG filed Critical Rollei Werke Franke und Heidecke GmbH and Co KG
Publication of GB1010226A publication Critical patent/GB1010226A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lenses (AREA)

Abstract

1,010,226. Viewfinder for camera. FRANKE & HEIDECKE G.m.b.H. [trading as ROLLEIWERKE FRANKE & HEIDECKE.] Oct. 4, 1962 [Oct. 7, 1961], No. 37586/62. Heading G2A. In a viewfinder of a single lens or twin-lens reflex camera, there is a convex lens and a negative lens separated by an air gap, the air gap being at least 3% of the focal length of the eyepiece formed by the convex and negative lens, the negative focal length of the negative lens being 0.4 to 0.5 times the focal length of the total focal length of the eyepiece and the radius of curvature of the convex lens on the eye side being at least equal to the focal length of the eyepiece. In the example, the focal length of the eyepiece is 152 mm, the negative focal length of the negative lens is 74 mm, the airgap is 5. 8 mm and the radius of curvature of the convex lens on the eye side is 167. 67 mm. As shown, the magnifying lens L 1 is a planoconvex lens cemented to the pentaprism P and the eyepiece in an interchangeable mounting comprises a biconcave lens L 2 of fluent glass and a biconvex lens L 3 of crown glass. Alternatively lens L 2 may be plenoconcave, the plane surface being cemented to the emergent surface of the pestaprism.
GB3758662A 1961-10-07 1962-10-04 Improvements in or relating to photographic cameras Expired GB1010226A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF0035084 1961-10-07

Publications (1)

Publication Number Publication Date
GB1010226A true GB1010226A (en) 1965-11-17

Family

ID=7095844

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3758662A Expired GB1010226A (en) 1961-10-07 1962-10-04 Improvements in or relating to photographic cameras

Country Status (1)

Country Link
GB (1) GB1010226A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132472A (en) * 1976-06-23 1979-01-02 Asahi Kogaku Kogyo Kabushiki Kaisha Replaceable finder system for single-lens reflex camera
US4206988A (en) * 1978-04-26 1980-06-10 Minolta Camera Kabushiki Kaisha Viewfinder for single lens reflex cameras
US4212526A (en) * 1978-08-22 1980-07-15 Minolta Camera Kabushiki Kaisha Viewfinder for single lens reflex camera
US4492440A (en) * 1981-01-31 1985-01-08 Olympus Optical Co., Ltd. Finder optical system
US4509831A (en) * 1981-03-13 1985-04-09 Olympus Optical Co., Ltd. Diopter adjustable eyepiece used for view-finders of single-lens reflex cameras or the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132472A (en) * 1976-06-23 1979-01-02 Asahi Kogaku Kogyo Kabushiki Kaisha Replaceable finder system for single-lens reflex camera
US4206988A (en) * 1978-04-26 1980-06-10 Minolta Camera Kabushiki Kaisha Viewfinder for single lens reflex cameras
US4212526A (en) * 1978-08-22 1980-07-15 Minolta Camera Kabushiki Kaisha Viewfinder for single lens reflex camera
US4492440A (en) * 1981-01-31 1985-01-08 Olympus Optical Co., Ltd. Finder optical system
US4509831A (en) * 1981-03-13 1985-04-09 Olympus Optical Co., Ltd. Diopter adjustable eyepiece used for view-finders of single-lens reflex cameras or the like

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