| 摘要 |
PURPOSE:To provide an interchangeable lens which can be used by the same operation as a conventional front focusing system though it is provided with an inner focusing system optical system. CONSTITUTION:A distance display to an object is provided on the outer circumference 12b of a manual focus ring 12 and an encoder for detecting an absolute position is provided on the ring 12. Besides, a dedicated motor 31 driving the ring 12 is provided. By such constitution, the ring 12 is rotated by the motor 31 at an automatic focusing time and an object distance at the automatic focusing time can be recognized by a user by the object distance display on the ring 12. |
