LENS SYSTEM COMMONALIZING PARTIAL LENS GROUP

摘要

To obtain two kinds of specifications including a wide-angle angle of view with an entire system downsized, by replacing a part of a lens.SOLUTION: A lens system can obtain: a first lens system that has a most object side first lens group LF1, and at least one positive lens group LP on an image side of the first lens group; and a second lens system in which an LF2 is arranged instead of the first lens group LF1 and thereby an entire system focal length is on an a telephoto side, and satisfies a following conditional expression. 1.0L1/L21.5, 1.2f2/f12.5, 0.8Φ1/Φ21.4 where L1 and L2: an optical entire length of the first lens system and the second lens system, f1 and f2: a focal length of the first lens system and the second lens system, and Φ1 and Φ2: an effective system of the first lens system and the second lens system on a plane surface in a surface on a most object side of the first lens system.SELECTED DRAWING: Figure 1(A)