| 摘要 |
PURPOSE:To reduce an aberration variation due to focusing, and also to make a titled lens small-sized and light, by constituting so that the first converging lens group, the second diverging lens group and the third diverging lens group are placed from an object side, and also a specified conditional equation is satisfied. CONSTITUTION:A titled telephoto lens constituted so that the first converging lens group G1, the second diverging lens group G2 and the third diverging lens group G3 are placed from an object side, and the conditional equationsIand II are satisfied when a focal distance as the whole lens system, a focal distance of the first converging lens group G1, a focal distance of the second diverging lens group G2, and a space in an infinity focused state of an image side principal point of the first converging lens group G1 and an object side principal point of the second diverging lens group G2 are denoted as F, f1, f2 and (e), respectively. By moving the second diverging lens group G2 constituted in this way to an image side on the optical axis, focusing to an object of a shorter distance is executed, and it is possible to suppress the extent of movement in this case to a suitable extent, and also to suppress an aberration variation to a small extent. |
