Patent ID: 8134783
Filing Date: 2012-03-13
Classification: G02B

Abstract:
1. A zoom lens system, comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; and a rear lens group including a lens unit having a positive refractive power, wherein: at least one of the first lens unit and the second lens unit is moved for zooming so that an interval between the first lens unit and the second lens unit at a telephoto end is larger than an interval between the first lens unit and the second lens unit at a wide angle end; the first lens unit includes at least one negative lens; and the following conditions are satisfied: where νd 1 n and θgF 1 n represent an Abbe number and a partial dispersion ratio of a material of the at least one negative lens, respectively.