| 摘要 |
PURPOSE:To enable a photographer to adjust the rotational resistance of an operating ring to be desired one when a lens is manually operated. CONSTITUTION:A lens group 23 sliding inside a barrel 20 by rotating the operating ring 25 fitted and inserted outside the lens barrel 20 is provided, a rotating ring 28 is fitted and inserted to the barrel 20 while being adjacent to the ring 25, and a clutch ring 30 intermittently transmitting rotation from the ring 28 to the ring 25 is provided between the ring 25 and the ring 28. Succeeding to the ring 28, an adjusting ring 29 is screwed onto a screw part provided on the external periphery of the barrel 20, and an O ring 31 is interposed between the ring 28 and the ring 29. When the lens is manually operated, the ring 30 is slid by a switching lever 45, the ring 28 is connected to the ring 25, and also the ring 29 is rotated to press the ring 31 to the ring 29, so that the rotational resistance of the ring 25 in the case of rotating can be adjusted. |
