Patent ID: 9148575
Filing Date: 2015-09-29
Classification: G02B,H04N

Abstract:
1. A zoom lens comprising a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power in an order from an object side to an image side, the first, second and third lens units moving during zooming such that a spacing between adjacent lens units changes, the second lens unit and the third lens unit being positioned on the object side at a telephoto end in comparison to at a wide angle end, and the third lens unit moving during focusing, wherein conditional expressions below are met, where β2w represents a lateral magnification of the second lens unit at the wide angle end, β2t represents a lateral magnification of the second lens unit at the telephoto end, β3w represents a lateral magnification of the third lens unit at the wide angle end, β3t represents a lateral magnification of the third lens unit at the telephoto end, f1 represents a focal length of the first lens unit, and f2 represents a focal length of the second lens unit.