Patent ID: 8031410

Claim:
A zoom lens comprising, in order from its object side: a first lens unit having a negative refracting power; a second lens unit having a positive refracting power; and a third lens unit having a refracting power, wherein: during zooming from the wide angle end to the telephoto end, a distance between the first lens unit and the second lens unit decreases, a distance between the second lens unit and the third lens unit changes, the first lens unit comprises, in order from the object side, a first lens element, which is a negative lens element, and a second lens element, which is a positive lens element, the negative lens element and the positive lens element satisfies the following conditional expressions (2) and (3): 2.01 <nd 12 <2.35 (2) 18.58 <vd 11 −vd 12 <50 (3), where nd 12 is a refractive index of the second lens element in the first lens unit for the d-line, vd 11 is an Abbe number of the first lens element in the first lens unit with respect to the d-line, and vd 12 is an Abbe number of the second lens element in the first lens unit with respect to the d-line, the zoom lens satisfies the following condition (8): 3.8 <f t /f w <10 (8) where f w is a focal length of the zoom lens at the wide angle end, and f t is a focal length of the zoom lens at the telephoto end, and the third lens unit has a negative refracting power and is located closer to the object side at the telephoto end than at the wide angle end.