Patent ID: 6606204
Filing Date: 2003-08-12
Classification: G02B

Abstract:
A wide-angle three-group zoom lens, comprising:a first group of lenses having negative refracting power, a second group of lenses having positive refracting power, and a third group of lenses having positive refracting power, which are provided in sequence from an object side of the zoom lens, wherein zooming is effected by changing intervals between said lens groups; and wherein said second group of lenses further comprises, in sequence from said object side, a biconvex lens group 2A, a lens group 2B formed by cementing two or more lenses together, an aperture, a lens group 2C formed by cementing two or more lenses together, and a lens group 2D which has positive refracting power and whose convex side is oriented toward the image surface side.