Camera having means for correcting shutter time by measuring the

Details Camera having means for correcting shutter time by measuring the Camera having means for correcting shutter time by measuring the

1994-03-10

1996-07-02

Adams, Russell E.

354431, G03B 708

Patent

active

055327850

ABSTRACT:
A shutter operation detection device comprising a light emitting diode and a photo transistor is provided in proximity to the shutter curtains to measure the actual exposure time. The difference between the control exposure time, which is based upon the brightness value of the subject to be photographed and the film sensitivity, and the actual exposure time is determined. The control exposure time for the next session is corrected based upon this difference. The amount of correction for increasing the control exposure time is differentiated from the amount correction for decreasing the control exposure time.

REFERENCES:
patent: 4907027 (1990-03-01), Kobe et al.
patent: 5014082 (1991-05-01), Farrington
patent: 5225865 (1993-07-01), Shiomi et al.

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