Patent ID: 7885013

Claim:
A zoom lens comprising, in order from an object side thereof: a first lens unit having a positive refracting power; a second lens unit having a negative refracting power; and a third lens unit having a positive refracting power, wherein zooming is performed by changing distances between the lens units, the second lens unit comprises two negative lens elements and one positive lens element, and the lens element closest to the object side in the second lens unit is a negative lens element, and the zoom lens satisfies the following conditional expressions: 0.60 <Σd 2G /I mw <1.95 (1-1) 1.830<N 2ave <2.000 (1-2) where Σd 2G is a thickness of the second lens unit on the optical axis, I mw is a maximum image height at the wide angle end of the zoom lens, and N 2ave is an average of refractive indices for the d-line of all the lens elements in the second lens unit, wherein the term “lens element” refers to an optical member that satisfies 0.1<L/I mw , where L is a thickness of the optical member in the second lens unit on the optical axis.