Patent ID: 8493666

Claim:
A zoom lens comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; and a third lens unit having a positive refractive power, wherein during zooming, each lens unit is configured to move to cause distances among the lens units to vary, wherein the first lens unit consists of one negative lens and two positive lenses, and wherein, when θgF is a relative partial dispersion of a material of each positive lens included in the first lens unit and νd is an Abbe number of the material of each positive lens included in the first lens unit, each of the positive lenses included in the first lens unit satisfies the following conditions: 55.0<νd<100.0 0.52<θgF<0.59 θgF+0.00163×νd>0.65.