Patent ID: 7586693

Claim:
A telephoto lens comprising, in order from an object side: a first lens group having a positive refracting power, the first lens group comprising a first sub group and a second sub group; a second lens group having a negative refracting power; a third lens group having a positive refracting power; a fourth lens group having a negative refracting power, wherein when focusing from infinity to a near point, the second lens group is moved to an image side in an optical axis direction, wherein the first sub group having two biconvex lenses and a biconcave lens, and the second sub group having a negative lens and a positive lens, and wherein the following Conditional Expression (1) is satisfied: 1.5< f 1 a/f 1 b< 2.2 (1) where, f 1 a denotes a focal length of the first sub group, and f 1 b denotes a focal length of the second sub group.