Patent ID: 8526121
Filing Date: 2013-09-03
Classification: G02B

Abstract:
1. A zoom lens, comprising: 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 fourth lens unit having a positive refractive power, wherein the first, second, third and fourth lens units are arranged in order from an object side to an image side, wherein the first lens unit is fixed, and the second and fourth lens units are moved so that a distance between the first lens unit and the second lens unit is increased and a distance between the second lens unit and the third lens unit is decreased at the time of zooming from a wide angle end to a telephoto end, wherein the first lens unit includes a first negative lens, a first positive lens, a second negative lens, a second positive lens, and a third positive lens in order from the object side to the image side, the third and fourth lens units include two or more lenses, and wherein, when f are satisfied.