Zoom lens system

摘要

The invention relates to a high-performance zoom lens system which can use a diffractive surface therein for use with an image sensor having a number of pixels. The zoom lens system includes at least a first lens group G1 having positive power and a second lens group G2 having negative power between an object side of the system and an aperture stop S. The first lens group G1 includes at least one diffractive surface r1, and satisfies the following condition: 0.001<fS/fDOE<0.025 (1) Here fS= 2ROOT f(fWxfT) wherein fW and fT are focal lengths of the zoom lens system at its wide-angle end and its telephoto end, respectively, and fDOE is a focal length of the diffractive surface r1.