Patent ID: 6327099
Filing Date: 2001-12-04
Classification: G02B

Abstract:
A zoom lens comprising, in order from an object side:a first lens unit of negative refractive power;a second lens unit of positive refractive power, which has, in order from an object side, a first lens sub-unit of negative refractive power, and a second lens sub-unit of positive refractive power, an image being displaced by moving said second lens sub-unit in such a manner as to have a component perpendicular to an optical axis;a third lens unit of positive refractive power; anda fourth lens unit of negative refractive power,wherein, when zooming from a wide-angle end to a telephoto end is performed, the spacing between said first and second lens units increases, and the spacing between said third and fourth lens units decreases, andwherein the following conditions are met:-0.9<f2a/ft<-0.4, and-90<f1/ft<-5where ""ft"", ""f2a"", and ""f1"" respectively designate the focal-length of the entire system at the telephoto end, the focal-length of said first lens sub-unit, and the focal-length of said first lens unit.