GB536706A - Improvements in or relating to variable power viewfinders - Google Patents

Improvements in or relating to variable power viewfinders

Info

Publication number
GB536706A
GB536706A GB4347/40A GB434740A GB536706A GB 536706 A GB536706 A GB 536706A GB 4347/40 A GB4347/40 A GB 4347/40A GB 434740 A GB434740 A GB 434740A GB 536706 A GB536706 A GB 536706A
Authority
GB
United Kingdom
Prior art keywords
lens
slots
objective
camera
lenses
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
GB4347/40A
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.)
Kodak Ltd
Original Assignee
Kodak Ltd
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 Kodak Ltd filed Critical Kodak Ltd
Publication of GB536706A publication Critical patent/GB536706A/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
    • G02B15/144—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 four groups only
    • G02B15/1441—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 four groups only the first group being positive
    • G02B15/144115—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 four groups only the first group being positive arranged ++++

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Telescopes (AREA)

Abstract

536,706. Telescopes. KODAK, Ltd. March 8, 1940, No. 4347. Convention date, May 10, 1939. [Class 97 (i)] A variable power view finder for use with a camera using interchangeable objectives has a field defining diaphragm opening of fixed size and shape such that it limits the image exactly to that produced in the camera when the magnification corresponds to the focal length of the objective in use. Its optical system comprises a fixed lens 22 adjacent the eyepiece 20, an objective 23, and two simultaneously movable collective lenses 24, 25. The position of the lens 24 is continuously adjustable from within the focus of the lens 23 to a point beyond the focus, and its movements, and simultaneous movement of the lens 25, may be effected by slots 15, 16 in a rotatable sleeve 12, the slots being in engagement with pins 13, 14 projecting from the lens rims through longitudinal slots 17, 18 in a tube 11. The front lens 23 may be adjustable for focusing objects at different finite distances. The final image produced by the lenses 23, 24, 25 may be real or virtual and at a finite or infinite distance, and the image thereof produced by the lens 22 is formed in the fixed aperture of a diaphragm 21. Notches in the edges of the slots 15, 16, or other stops, or a scale adjacent the slots, may indicate the positions of the lenses 24, 25 appropriate to the camera objective in use.
GB4347/40A 1939-05-10 1940-03-08 Improvements in or relating to variable power viewfinders Expired GB536706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US536706XA 1939-05-10 1939-05-10

Publications (1)

Publication Number Publication Date
GB536706A true GB536706A (en) 1941-05-23

Family

ID=21985785

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4347/40A Expired GB536706A (en) 1939-05-10 1940-03-08 Improvements in or relating to variable power viewfinders

Country Status (1)

Country Link
GB (1) GB536706A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437032A (en) * 1945-08-09 1948-03-02 Edward K Kaprelian Variable field range and view finder
US2479792A (en) * 1948-05-15 1949-08-23 Bausch & Lomb Optical system for variable power telescopes
US2496069A (en) * 1948-06-30 1950-01-31 Rca Corp Variable length optical system without change of magnification
US2704487A (en) * 1952-07-22 1955-03-22 Optical system of variable focal length
US2732763A (en) * 1956-01-31 Varifocal lens constructions and devices
US2741155A (en) * 1951-09-11 1956-04-10 Watson W & Sons Ltd Variable magnification optical systems
DE1013090B (en) * 1954-12-20 1957-08-01 Hertel & Reuss Optik Und Feinm Rifle scope with variable magnification
US2873646A (en) * 1954-10-22 1959-02-17 Angenieux Pierre Mechanism for variable focal length objective
US2906171A (en) * 1955-12-20 1959-09-29 Bergstein Leonard Varifocal lens system
DE1109398B (en) * 1958-11-22 1961-06-22 Hertel & Reuss Telescope with changeable magnification
DE1113097B (en) * 1955-12-06 1961-08-24 Ednalite Optical Company Inc Lens system with adjustable focal length
US3433559A (en) * 1963-03-01 1969-03-18 Karl Vockenhuber Variable focal length optical system
GB2190514A (en) * 1986-05-16 1987-11-18 William Penton Nathan Optical device having a radially adjustable lens
US4806006A (en) * 1986-05-16 1989-02-21 Nathan William P Optical device with receiving means adjustable to view different portions of an image
EP0688439A1 (en) * 1993-03-09 1995-12-27 Benopcon, Inc. Wide angle binocular system with variable power capability

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732763A (en) * 1956-01-31 Varifocal lens constructions and devices
US2437032A (en) * 1945-08-09 1948-03-02 Edward K Kaprelian Variable field range and view finder
US2479792A (en) * 1948-05-15 1949-08-23 Bausch & Lomb Optical system for variable power telescopes
US2496069A (en) * 1948-06-30 1950-01-31 Rca Corp Variable length optical system without change of magnification
US2741155A (en) * 1951-09-11 1956-04-10 Watson W & Sons Ltd Variable magnification optical systems
US2704487A (en) * 1952-07-22 1955-03-22 Optical system of variable focal length
US2873646A (en) * 1954-10-22 1959-02-17 Angenieux Pierre Mechanism for variable focal length objective
DE1013090B (en) * 1954-12-20 1957-08-01 Hertel & Reuss Optik Und Feinm Rifle scope with variable magnification
DE1113097B (en) * 1955-12-06 1961-08-24 Ednalite Optical Company Inc Lens system with adjustable focal length
US2906171A (en) * 1955-12-20 1959-09-29 Bergstein Leonard Varifocal lens system
DE1109398B (en) * 1958-11-22 1961-06-22 Hertel & Reuss Telescope with changeable magnification
US3433559A (en) * 1963-03-01 1969-03-18 Karl Vockenhuber Variable focal length optical system
GB2190514A (en) * 1986-05-16 1987-11-18 William Penton Nathan Optical device having a radially adjustable lens
US4806006A (en) * 1986-05-16 1989-02-21 Nathan William P Optical device with receiving means adjustable to view different portions of an image
GB2190514B (en) * 1986-05-16 1989-12-13 William Penton Nathan Optical device having a radially adjustable lens
EP0688439A1 (en) * 1993-03-09 1995-12-27 Benopcon, Inc. Wide angle binocular system with variable power capability
EP0688439A4 (en) * 1993-03-09 1998-04-08 Benopcon Inc Wide angle binocular system with variable power capability

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