| 摘要 |
PURPOSE:To realize macro photography without separating the cam lens barrel, by providing an operation lens barrel movable in the optical axis direction while defining the turning of variable magnification lens and compensation lens in the cam lens barrel. CONSTITUTION:In the case of zoom photography, when a cam lens barrel 1 is turned in the direction of arrow Al, pins 8, 9 of variable magnification lens 2 and compensation lens 3 are prevented from turning by a defining device 13, so that the lenses 2, 3 are caued to move in the direction of the optical axis along the inclination of respective cam grooves for zoom 4, 5. In the case of macro photography, on the other hand, when a pin for macro photography 17 is pushed down and the cam lens barrel 1 is turned, the variable magnification lens 2 and the compensation lens 3 move along the cam grooves 4, 5, and the cam lens barrel 1 also moves in the direction of optical axis along the inclination of the cam groove for macro photography 16. When the inclination of the cam groove 16 is set to a specified angle, the variable magnification lens does not move in the direction of the optical axis substantially, so that macro photography may be enabled. |
