Patent ID: 9170407
Filing Date: 2015-10-27
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from an object side to an image side thereof: 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 ones of the lens units changes during zooming, wherein the first lens unit consists of, in order from the object side to the image side thereof, one negative lens element and one positive lens element, wherein the zoom lens satisfies the following conditional expressions: where M1 denotes a moving amount of the first lens unit during zooming from a wide-angle end to a telephoto end, M2 denotes a moving amount of the second lens unit during zooming from the wide-angle end to the telephoto end, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, and Z denotes a zoom ratio of the zoom lens, and wherein a sign of a value representing each of the moving amounts is positive in a case where a corresponding one of the lens units is positioned nearer to the object side at the telephoto end than at the wide-angle end, and the sign is negative in a case where the lens unit is positioned nearer to the image side at the telephoto end than at the wide-angle end.