| 摘要 |
PURPOSE:To set up an ideal delivered value for near photographing by making a member fixing the delivering limit of a focusing lens member for close photographing on the subject side follow cam grooves formed on a cam cylinder for zooming. CONSTITUTION:A variator top 61 engaged with variator grooves 59b, 57b is fixed on a vriator lens frame 62 and a variator top 63 engaged with compensator grooves 59c, 57c is fixed on a compensator lens frame 64. A helicoid 57b is engaged with an inner helicoid 65b, a focusing top 67 is engaged with a groove 55a and its moving range is limited. When an operation ring 55 is moved front and back, a straight-driving ring 56 and a motive top 60 make a straight drive and the variator top 61 and the compensator top 63 are moved to execute zooming. The operation ring 55 is rotated around the straight-driving ring 56 and a focusing lens group 51 is moved to an optical axis to execute focusing. |
