PURPOSE: To attain precise automatic focusing by moving a focusing lens by the driving force of the 2nd motor on the replacing lens side which is rotated in accordance with the rotational direction and rotational variable of the 1st motor on the camera body side.
CONSTITUTION: The 2nd motor M2 rotated in the turning direction of the 1st motor M1 on the camera body side by a variable corresponding to the rotational variable of the 1st motor M1 and moving a focusing lens group 6, a power supply BT2 for the motor M2 and a lens information outputting means 40 outputting lens information necessary for the convertion of the rotational variable of the 1st motor M1 are included in the replacing lens. In addition, a focusing detecting means AP detecting defocusing variable and its direction of a lens 4 charged in the camera body on a proposed focus surface, a reading means RO connected to the lens information outputting means 40 and reading the lens information at the time of charging the lens 4, an arithmetic means MU executing the operation for converting the defocusing variable detected by the focusing detecting means AP into the rotational variable of the 1st motor M1 by using the lens information, and the 1st motor driving means MDC rotating the 1st motor M1 by the calculated rotational variable are built in the replacing lens.
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EGAWA TAKESHI
MATSUSHITA SHIYUUZOU
