| 摘要 |
PURPOSE:To eliminate a failure photograph caused by a camera shake by using a higher speed shutter at the time of short distance photographing, and to widen the width of photographing by using a lower speed shutter at the time of long distance photographing. CONSTITUTION:A photometric optical system 101 executes photometry of a photographing area, and inputs the defocus amount of an output processed by a photometric circuit 105 and a focused position detected by a fact that a field light is led to a photometric circuit 110 in a photographing optical system 106 to a camera control microcomputer 115 having an arithmetic means for deriving the lower limit value of a shutter speed or a boundary value TVH of a shutter speed for warning a camera shake photograph in accordance with an expression TVH=log2f-(DV-DV0)/2 (DV0 denotes a distance in which a nondefective rate of a finish photograph is not deteriorated, when a standard object to be photographed is photographed at a shutter speed TV=log2f in a photographing focal distance (f)). This photometric value and the distance measured value are used in order to control flash light emission, exposure, and a control circuit of a lens by a computer. An exposure control circuit 113 executes the exposure control by driving an aperture blade 108, and a lens control circuit 114 controls the driving of a photographic lens 107, and outputs a variation of a focal distance (f), and a focused principal object distance DV to the computer 115. |
