| 摘要 |
PURPOSE:To easily execute an interchange of a photographic lens even after a condition is set by installing an arithmetic means for converting an object distance signal based on an angle of depression to a focus feed quantity of the photographic lens to each photographic lens. CONSTITUTION:At the time of interchanging a lens mechanism 2, an arithmetic means 7 and a focus driving part 4 are interchanged as one body. In this case, a second lens mechanism, focus driving part and arithmetic means are interchanged newly instead of a first lens mechanism 2, the focus driving part 4 and the arithmetic means 7, and even in case when a camera is pointed to a position A again, a distance detecting means 6 calculates an object distance Da and outputs an object distance signal S2. The arithmetic means which is inputted this signal S2 derives a focus feed quantity Fa' of the lens mechanism from a focus feed quantity when the object distance of the interchanged lens mechanism is D, the minimum photographic distance of the interchanged lens mechanism, and a focus feed quantity at the time of the minimum photographic distance of the interchanged lens mechanism, and outputs it as a focusing control signal S3. Thereby, the focus driving part focuses the lens mechanism to the position A. |
