Patent ID: 9069156
Filing Date: 2015-06-30
Classification: G02B,H04N

Abstract:
1. A zoom lens capable of changing a distance between adjacent lens units in zooming, the 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; an aperture stop; a third lens unit having a positive refractive power; and a rear lens group including at least one lens unit, wherein the first lens unit is positioned closer to the object side at a telephoto end than at a wide-angle end, wherein the third lens unit includes positive lenses, materials of the positive lenses included in the third lens unit satisfy the following expression: wherein the following conditional expressions are satisfied: where θgF3P is a partial dispersion ratio of material of at least one of the positive lenses in the third lens unit, νd3P is Abbe's number of at least one of the positive lenses, fW and fT are focal lengths of a total system at the wide-angle end and at the telephoto end respectively, f1 is a focal length of the first lens unit, and f3 is a focal length of the third lens unit.