| 摘要 |
A variable focal length lens has, in order from the object side, a first lens group (G1) that has a negative index of refraction and a second lens group (G2) that has a positive index of refraction. Focal length is changed by varying the air space for the first lens group and the second lens group. The lens also has adjustment mechanisms (20, 30) that carry out positional adjustments giving shift eccentricity or tilt eccentricity of part of the first lens group or all of the lenses and part of the second lens group after assembly of the first lens group and the second lens group. Thereby, a variable focal length imaging lens that can achieve excellent optical performance at a low cost, an optical device having the same, and a method for adjusting the imaging lens can be provided. |
