Abstract A TTL automatic flash control device for a flash light source for a camera is disclosed. The device has a flash control unit for controlling flashing of the flash light source. In sequential flashing photographic operation mode in which a plurality of flashing photographic operations are conducted sequentially, the flash control unit preliminarily flashes the flash light source at least once before the series of flashing photographic operations are initiated. Thereafter, the flash control unit performs main flashing of the flash light source for each shot. The device further includes a weighting value operating unit for detecting distribution of reflected light regarding a plurality of photometric areas obtained by dividing a field during the preliminary flashing and for calculating a weighting value for each of the photometric areas on the basis of the distribution of the reflected light, and a quantity of light control unit for metering each of the photometric areas on the basis of the weighting value thereof during the main flashing and for controlling a quantity of light emitted from the flash light source.
A TTL automatic flash control device for a flash light source for a camera, said device comprising: flash control means for controlling flashing of said flash light source, in sequential flashing photographic operation mode in which a plurality of flashing photographic operations are conducted sequentially, said flash control means preliminarily flashing said flash light source at least once before the series of flashing photographic operations are initiated, thereafter, said flash control means performing main flashing of said flash light source for each shot; weighting value operation means for detecting distribution of reflected light regarding a plurality of photometric areas obtained by dividing a field during the preliminary flashing and for calculating a weighting value for each of the photometric areas on the basis of the distribution of the reflected light; and quantity of light control means for metering each of the photometric areas on the basis of the weighting value thereof during the main flashing and to control a quantity of light emitted from said flash light source.
Claim 2
Dependent Claim
168 words
A TTL automatic flash control device for a flash light source for a camera, said device comprising: flash control means for controlling flashing of said flash light source, in sequential flashing photographic operation mode in which a plurality of flashing photographic operations are conducted sequentially, said flash control means preliminarily flashing said flash light source at least once before the series of flashing photographic operations are initiated, thereafter, said flash control means performing main flashing of said flash light source for each shot; weighting value operation means for detecting distribution of reflected light regarding a plurality of photometric areas obtained by dividing a field during the preliminary flashing and for calculating a weighting value for each of the photometric areas on the basis of the distribution of the reflected light; and quantity of light control means for metering each of the photometric areas on the basis of the weighting value thereof during the main flashing and to control a quantity of light emitted from said flash light source.
Claim 3
Dependent Claim
32 words
A TTL automatic flash control device according to claim 1, wherein in the sequential flashing photographic operation, the plurality of flashing photographic operations are sequentially conducted by pressing a release button once.
Claim 4
Dependent Claim
35 words
A TTL automatic flash control device according to claim 1, wherein the sequential flashing photographic operation comprises bracketing photography in which said quantity of light control means changes the quantity of light for each shot.