Patent ID: 6987622

Claim:
A zoom lens comprising, in order from an object side to an image side: a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a negative optical power, a fourth lens unit having a positive optical power, and a fifth lens unit having a positive optical power, wherein the second lens unit and the third lens unit are moved during zooming and the fifth lens unit is moved during focusing, and the fifth lens unit consists of one negative lens element and two positive lens elements in order from the object side to the image side, and the following conditional expressions are satisfied: 0<α5<0.35 1.85<ν5 p /ν5 n where α5 represents an incident reduced tilt angle of an axial marginal ray to the fifth lens unit in a case where it is normalized to an optical power φw at a wide-angle end of the whole system of zoom lens, ν5p represents an average value of Abbe's numbers of materials of the positive lens elements of the fifth lens unit, ν5n is an Abbe's number of a material of the negative lens element of the fifth lens unit.