| 摘要 |
PURPOSE:To assure a good focusing operation in the state meeting photographing conditions by providing a rotating angle regulating means which can arbitrarily select the rotating speed of a rotating handle at the time of focusing from a very close object to an infinite object and signal transmitting means which transmits a prescribed signal. CONSTITUTION:The rotating angle regulating means 5 which is so constituted as to allow the discrete selection of the rotating angle of the rotating handle 2 to be rotated at the time of the focusing from the very close object to the infinite object and the signal transmitting means 8, 9 which transmit the angle signal relating to the rotating angle determined by the rotating angle regulating means and the position signal in the rotating position of the handle 2 are provided. A control circuit 9 receives the rotating angle signal from a potentiometer 8 detecting the rotating angle relating to the focusing of the handle 2 and transmits the same as the position signal for a focusing lens via a cable connector 10 to a lens body. Thus, the rotating speed of the rotating handle is changed from, for example, one turn to three turns so as to meet the photographing conditions and the focusing is executed in the good state. |
