Patent EP-0450953-A1 (EP)
Inventor: YASUKAWA SEIICHI
IPC: G03B7/16
Filed: 1991-04-04
Abstract: A TTL automatic light controlling camera system including a camera body capable of performing a TTL multicontrol arranged in such a manner that information about the distribution of the quantities of light reflected from a plurality of divided regions of a subject field is detected by performing a previously emitting light and an intrinsic light emission is performed after the relationship of weighting of the divided regions has been determined in accordance with the information about the distribution of the quantities of light reflected in such a manner that the emission of light performed at the intrinsical light emission is controlled by the determined relationship of weighting and a TTL normal light control in which a normal light emission control is performed without performing the previous light emission and a flashing device capable of successively performing the previous light emission and the intrinsic light emission in response to a signal supplied from the camera body, the TTL automatic light controlling camera system comprising: a TTL light control mode switching device disposed in the camera body and capable of switching the TTL light controlling method between a TTL multicontrol mode in which a TTL multicontrol operation is performed while performing the previous light emission and a TTL normal light control mode in which the TTL normal light control operation is performed without the previous light emission; a light control mode switching device disposed in the flashing device and capable of switching the light control method between a first light control mode in which the quantity of light emitted is determined in response to a light emission stop signal supplied from the camera body and a second light control mode in which the quantity of light emitted is determined by the light control mode switching device; a first transmission device for transmitting information about the result of the selection made by the TTL light control mode switching device from the camera body to the flashing device; a second transmission device for transmitting information about the result of the selection made by the light control mode switching device from the flashing device to the camera body; a detection device for detecting whether or not the mounted flashing device acts in synchronization with the TTL multicontrol; a TTL light control operation control device disposed in the camera body and performs the TTL multicontrol only when said TTL multicontrol mode has been selected and as well as the first light control mode has been selected, performs the TTL normal light control when the TTL normal light control mode has been selected and as well as said first light control mode has been selected and performs the TTL normal light control when a fact that a flashing device which cannot previously emit light in synchronization with the TTL multicontrol has been mounted is detected even if the TTL multicontrol mode has been selected; and a light emitting device disposed in the flashing device which successively performs the previous light emission and the intrinsic light emission only when the TTL multicontrol mode has been selected and as well as the first light control mode has been selected and which performs only the intrinsic light emission in the other cases.