| 摘要 |
PURPOSE:To reduce the size of a camera and to facilitate parts work and assembly while preventing an increase in the size of a lens barrel, by rotating the lens barrel in a plane containing the optical axis of a focusing lens according to the movement of the focusing lens, and putting an auxiliary lens off the optical axis. CONSTITUTION:When an auxiliary lens systems L4-L7 are on the optical axis behind focusing lens systems L1, L2, and L3, a short focus lens is constituted and when the auxiliary lens systems are put off the optical axis, a long focus lens. When a focusing ring 3 is rotated, the lens systems L1, L2, and L3 are moved out beyond a short focus area and after a holding frame 14 for the lens L3 moves away from an auxiliary lens system holding frame 10 sufficiently, a lever 11 rotates to a position shown by a solid line by the rotating force of the focusing ring 3, and consequently the lens holding frame 10 and auxiliary lens systems united with it also oscillate in the vertical plane containing the optical axis of focusing lens systems L1, L2, and L3 to be put off the optical axis. |
