Patent ID: 7321469

Claim:
A zoom lens comprising: a first lens of a negative lens; a second lens of a positive lens; an aperture stop; a third lens of a negative lens; and a fourth lens of a positive lens in this order from an object side of the zoom lens, wherein a zooming operation of the zoom lens is performed by varying mutual distances among the first to fourth lenses, and the zoom lens satisfies conditional expressions (1) to (4): 0.35< f 2/ f 4<0.70 (1) 0.04<( dt−dw )/ fw< 0.40 (2) 1.65< f 4/ fw< 2.20 (3) 50<νd1 (4) wherein f 2 designates a focal length of the second lens; f 4 designates a focal length of the fourth lens; dt designates a distance along an optical axis between the second lens and the third lens in a wide-angle end of the zoom lens; dw designates a distance along the optical axis between the second lens and the third lens in a telephoto end of the zoom lens; fw designates a focal length of a total system of the zoom lens in the telephoto end; and νd 1 designates an Abbe number of the first lens at the d-line.