Patent ID: 9651762
Date: 2017-05-16
CPC Classifications: G02B

Claim:
1. 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; an aperture stop; a third lens unit having a positive refractive power; a fourth lens unit having a positive refractive power; and a fifth lens unit having one of a positive refractive power and a negative refractive power, wherein the first lens unit is configured not to move for zooming, and the second lens unit, the third lens unit, and the fourth lens unit are configured to move during zooming to change intervals between adjacent lens units, wherein the second lens unit is positioned closer to the image side and the third lens unit is positioned closer to the object side at a telephoto end than at a wide angle end, and wherein the following conditional expressions are satisfied: where fw represents a focal length of an entire system of the zoom lens at the wide angle end, f3 represents a focal length of the third lens unit, f4 represents a focal length of the fourth lens unit, β34w represents a lateral magnification of a lens group consisting of the third lens unit and the fourth lens unit at the wide angle end, and β34t represents a lateral magnification of the lens group consisting of the third lens unit and the fourth lens unit at the telephoto end.