GB1032484A - Improved photometric apparatus for cameras - Google Patents

Improved photometric apparatus for cameras

Info

Publication number
GB1032484A
GB1032484A GB400365A GB400365A GB1032484A GB 1032484 A GB1032484 A GB 1032484A GB 400365 A GB400365 A GB 400365A GB 400365 A GB400365 A GB 400365A GB 1032484 A GB1032484 A GB 1032484A
Authority
GB
United Kingdom
Prior art keywords
photo
cell
exposure
sources
cells
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
GB400365A
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.)
PIGNONS SA
Original Assignee
PIGNONS SA
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 PIGNONS SA filed Critical PIGNONS SA
Publication of GB1032484A publication Critical patent/GB1032484A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4214—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for view-taking apparatus
    • 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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/08—Waterproof bodies or housings

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Exposure Control For Cameras (AREA)
  • Viewfinders (AREA)

Abstract

1,032,484. Photographic apparatus. PIGNONS S.A. Jan. 29, 1965 [Feb.13, 1964], No. 4003/65. Heading G2A. In a photo-electric exposure control arrangement, the output of an exposure regulating photocell, produced by parasitic light from sources not to be recorded by the camera, is balanced out electrically by the output of a compensating cell which is positioned to receive light, in full face, from these sources. In a reflex camera (Fig 1, not shown), the photo-cells are mounted between the pentaprism and the eye lens of a viewfinder eyepiece and face in opposite directions. The cells may be connected in bridge circuits (Figs 2-4, not shown) having a resistor or potentiometer which can be varied to return a galvanometer pointer to a reference index. Alternatively, the galvanometer G may give a reading corresponding to the exposure, as determined by photo-cell 8 and modified by compensating photo-cell 9. Suitably selected resistors R8 and R9 are provided.
GB400365A 1964-02-13 1965-01-29 Improved photometric apparatus for cameras Expired GB1032484A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH172564A CH398295A (en) 1964-02-13 1964-02-13 Photometric device for camera

Publications (1)

Publication Number Publication Date
GB1032484A true GB1032484A (en) 1966-06-08

Family

ID=4217131

Family Applications (1)

Application Number Title Priority Date Filing Date
GB400365A Expired GB1032484A (en) 1964-02-13 1965-01-29 Improved photometric apparatus for cameras

Country Status (3)

Country Link
CH (1) CH398295A (en)
DE (1) DE1264241B (en)
GB (1) GB1032484A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1772571A1 (en) * 1967-06-15 1970-12-03 Asahi Optical Co Ltd Light meter with light measurement through the lens for single-lens reflex camera
US3836921A (en) * 1970-05-28 1974-09-17 Asahi Optical Co Ltd Camera eyepiece light compensation arrangement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073220A (en) * 1959-05-29 1963-01-15 Bell & Howell Co Exposure control device for a photographic camera

Also Published As

Publication number Publication date
CH398295A (en) 1965-08-31
DE1264241B (en) 1968-03-21

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