Automatic electronic flash
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 5, 1986
Grant Date -
N/A
app pub date -
Nov 13, 1984
filing date -
Nov 15, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic electronic flash measures brightness of a predetermined photographing angle including a photographic object, and using the measured brightness and film sensitivity indicates a stop value to be set in camera when the photographic scenery has rear light, and the automatic electronic flash operation is automatically lowered by the extent of F-stop value (automatic F-stop value) of 1-2 EV than the indicated stop value, thereby satisfactory automatic fill-in photographing with the automatic electronic flash can be made; and the automatic electronic flash further comprises means to warn when the brightness of the photographic scenery changes from the measured value, and besides, the above-mentioned controlling corresponding to the automatic F-stop value is examined taking account of the scenery brightness and film sensitivity and produce another warning when automatic F-stop value is an impractical value.
First Claim
Family
International Classification(s)
Cited Art Landscape
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