Photometric apparatus for camera

Details Photometric apparatus for camera Photometric apparatus for camera

1997-05-23

2000-06-06

Gray, David M.

Photography

Having photocell at specific position within camera

396274, G03B 1724

Patent

active

060729597

ABSTRACT:
A photometric apparatus which satisfies the demands for reductions in the size, thickness and cost and which is highly optioned despite a simple arrangement. A photometric optical system provided separately from a photographic optical system (1) has at least one diffractive optical element (10). The diffraction surface of the diffractive optical element (10) is provided on a convex lens surface to have a converging action. Alternatively, the diffraction surface of the diffractive optical element (10) is provided on a concave lens surface to have a diverging action.

REFERENCES:
patent: 5668919 (1997-09-01), Ito

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