| 摘要 |
PROBLEM TO BE SOLVED: To correct the positional deviation of the best image surface caused by the change of a diaphragm diameter all over a focal distance range by driving a focusing group by an adjusting amount obtained according to focus information and diaphragm information. SOLUTION: This device is provided with an, adjusting amount arithmetic means for calculating the adjusting amount of at least one lens group of a zoom lens by an operation expression based on focal distance information for regulating variation corresponding to the focal distance of a lens entire system, the diaphragm information for regulating the variation corresponding to the diaphragm diameter of the aperture diaphragm and a specified correction factor previously stored. According to the focal distance information and the diaphragm information, the adjusting amount of the focusing lens group G3 is decided based on the specified correction factor previously stored in a camera main body and the operation expression. By driving the focusing lens group G3 by the adjusting amount obtained in such a way, the best image surface and the film surface are controlled to be aligned over each focal distance state and each diaphragm state. |
