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US 4,285,585 AGranted
Exposure control compensating means for close-up photography
AssigneeFuji Photo Optical Co., Ltd.
InventorSaburo Numata
Life of this patent
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Abstract
In an automatic exposure control camera in which exposure is controlled based on an output of an arithmetic unit, the F-value information of the taking lens of the camera in the arithmetic unit is compensated by use of a distance information from a distance detector, and the exposure is controlled based on the compensated F-value, whereby the exposure is compensated in close-up photography.
Claims5
In a camera, exposure control apparatus including means for automatically compensating exposure control for close-up photography in accordance with the formula ##EQU2## where FD=effective F-value
- F=a preselected F-value
- l=the actual distance from the camera lens to an object to be photographed
- f=the actual focal length of the lens,
- and wherein the value of l/(l-f) is always greater than 1,
- said means comprising:
- (a) an arithmetic unit;
- (b) an F-value input means connected to said arithmetic unit;
- (c) distance information input means connected to said arithmetic unit;
- (d) a focal length information input means connected to said arithmetic unit;
- (e) said arithmetic unit providing an effective F-value exposure control output according to said formula based on said inputs.
7 more elements
Dependencies are inferred from the claim text.