PURPOSE: To perform excellent AF control on a camera side by providing a conversion means for converting information on the acting position of an exposure control means in a lens part to a state which can be discriminated on the camera side.
CONSTITUTION: A position information conversion means 21 for generating iris position information required by a camera for video movie based on various kinds of information transmitted from a lens for a still camera to a conversion adapter AD and by internally counting iris driving pulses is provided. Namely, a microcomputer 19 in the conversion adapter AD has the means 21 for generating the iris position information for the video movie based on the various information for the still lens transmitted from the lens side LS. The iris position information generated by using the means 21 is changed according to a previously fixed format and transmitted to the camera side CM through a duplex data communication line 11A as the position information.
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