Patent ID: 7872807

Claim:
A zoom lens, comprising: a first lens group, a stop located on an image side of said zoom lens with respect to said first lens group, and two lens groups located on an image side of said zoom lens with respect to said stop, wherein: a distance between said two lens groups changes during zooming, said first lens group comprises a positive lens element and a reflecting optical element for bending an optical path, a total number of positive lens elements in said first lens group is one, a total number of lens groups located on the image side with respect to said stop is two, said reflecting optical element is a prism that satisfies condition (4)″: 1.75<n pri (4)″ where n pri is a d-line refractive index of a medium of said prism in said first lens group, and wherein said two lens groups located on the image side with respect to said stop move during zooming.