Telescopic objective lens system
AssigneeAsahi Kogako Kogyo Kabushiki Kaisha
InventorTetsuya Abe
Life of this patent
Estimating the term…
Abstract
A telescopic objective lens system comprises a positive first lens group and a second lens group, in this order from the object. The second lens group comprises a first sub-lens group and a second sub-lens group, wherein the first sub-lens group is combined with the first lens group to be used for correcting axial chromatic aberration, the second sub-lens group is combined with the first lens group to be used for correcting field curvature; and wherein the combination of the first lens group and the first sub-lens group, and the combination of the first lens group and the second sub-lens group can be alternatively selected.
Claims10
A telescopic objective lens system comprising:
- a positive first lens group and a second lens group, in this order from an object, said second lens group comprising a first sub-lens group and a second sub-lens group, which are selectively attachable to said first lens group;
- wherein said first sub-lens group is attached to said first lens group to correct axial chromatic aberration, and said second sub-lens group is attached to said first lens group to correct field curvature.
Dependencies are inferred from the claim text.