Photography – With object illumination for exposure – Having artificial illumination termination control
Patent
1996-04-26
1998-01-13
Perkey, W. B.
Photography
With object illumination for exposure
Having artificial illumination termination control
G03B 1505
Patent
active
057088730
ABSTRACT:
The present invention relates to a flash photographing system for, in a case where the same subject of the photographing operation is repeatedly flash-photographed, performing an automatic bracket photographing operation such that the quantity of flash light to be emitted at each operation is sequentially shifted by a predetermined quantity. According to the present invention, there is provided a system of the foregoing type having a structure such that previous light emission is performed to receive light reflected from an object, and the quantity of emitted light received until the quantity of reflected light reaches a predetermined value is stored as a reference light quantity. When the quantity of light to be emitted in each main light emission operation is controlled, the quantity of light in each main light emission operation is monitored so as to subject the monitored quantity of light and the reference data to a comparison. Thus, the quantities of light to be emitted in the main light emission operation are controlled in accordance with data about the quantities of light respectively shifted from said reference quantity of light by predetermined quantities.
REFERENCES:
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patent: 4297011 (1981-10-01), Adams, Jr.
patent: 4416524 (1983-11-01), Takayama
patent: 4702585 (1987-10-01), Harada et al.
patent: 5130737 (1992-07-01), Azuma et al.
patent: 5367356 (1994-11-01), Kobayashi
Canon Kabushiki Kaisha
Perkey W. B.
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