| 摘要 |
PURPOSE:To improve the workability of the adjustment of a back focus by exactly driving a master lens to an original position as a reference even when the position detecting means of the master lens is not efficiently attached, at the time of adjusting the back focus. CONSTITUTION:At the time of adjusting the back focus, the number of pulses necessary for driving a master lens 2 from the attaching position of the reflective photosensor of a lens position detecting circuit 10 which detects the position of a master lens 2 to the original position where a focusing on the object at an infinite-point is operated at a zoom wide edge, is counted by a pulse counting circuit 12, and stored in an EEPROM 13. When a power source is supplied at the time of photographing, the master lens 2 is moved to the attaching position of the reflective photosensor of the lens position detecting circuit 10, and driven to the original position based on the data stored in the EEPROM 13, so that the photographing after that can be prepared. |
