Patent ID: 7529037

Claim:
A zoom lens comprising, in order from an object side to an image side thereof, a first lens unit having negative refracting power, a second lens unit having positive refracting power, and a third lens unit having positive refracting power, with a space between adjacent lenses varied for zooming, wherein: the first lens unit consists of a positive lens and a negative lens, the second lens unit comprises at least two positive lenses and at least one negative lens, the third lens unit consists of one positive lens, and the zoom lens satisfies the following conditions: n 1 >1.8 (4-1) n 2 >2.00170 (4-2) where n 1 is a refractive index of the negative lens in the first lens unit, and n 2 is a refractive index of the positive lens in the first lens unit.