Patent ID: 9706095
Date: 2017-07-11
CPC Classifications: G02B,G03B

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; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power, wherein a distance between adjacent lens units varies when performing zooming, when zooming is performed, the first lens unit is configured not to be moved, and at least the second lens unit and the third lens unit are configured to be moved, and when a lateral magnification of a composite lens system of the third lens unit and the fourth lens unit at a wide angle end is denoted by β34w, a lateral magnification of the composite lens system of the third lens unit and the fourth lens unit at a telephoto end is denoted by β34t, a lateral magnification of the second lens unit at the wide angle end is denoted by β2w, a lateral magnification of the second lens unit at the telephoto end is denoted by β2t, a lateral magnification of the third lens unit at the wide angle end is denoted by β3w, and a lateral magnification of the third lens unit at the telephoto end is denoted by β3t, the zoom lens is configured to satisfy the following conditional expressions: