Photometric device and method

Details Photometric device and method Photometric device and method

1995-06-06

1997-07-15

Adams, Russell E.

Photography

Exposure control circuit

Having plural photocells

396271, G03B 708, G03B 7099

Patent

active

056492430

ABSTRACT:
A photometric device that makes improved accuracy of screen photometry possible is disclosed. The photometric device includes a screen component that transmits a luminous flux from a subject field, a light emitting indicating device that is placed in the vicinity of the screen component and that indicates light emitting photographic information, and a photometry component that receives the transmitted luminous flux and outputs the received luminous flux as a first photometric value of the subject field. The photometric device is equipped with an adjustment device that determines a second photometric value based on a higher order or non-linear function of the first photometric value that differs from the first photometric value by a photometric value adjustment amount to compensate for the emitted light of the light emitting indicating device.

REFERENCES:
patent: 3860936 (1975-01-01), Harvey
patent: 4035815 (1977-07-01), Takahashi
patent: 4146379 (1979-03-01), Numata et al.
patent: 4681420 (1987-07-01), Suda et al.
patent: 5504553 (1996-04-01), Takagi

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