Patent ID: 7869135

Claim:
A zoom lens comprising, in order from an object side to an image side: a first lens unit having a negative refractive power; and a second lens unit having a positive refractive power, wherein an interval between the first and second lens units becomes smaller at a telephoto end than at a wide-angle end during zooming, wherein the first lens unit includes, in order from the object side to the image side: a first lens having a negative refractive power; a second lens having a negative refractive power, which is made of a plastic and has an aspheric lens surface; and a third lens having a positive refractive power, and wherein a refractive index and an Abbe number of the plastic (Nd, νd), a focal length of the second lens (fn), and a focal length of the first lens unit (f 1 ) satisfy the following conditions: Nd− 2.03+0.008 ·νd< 0 Nd− 1.97+0.0083 ·νd> 0 1.55<Nd<1.65 0.5 <fn/f 1<2.0.