Patent ID: 6850373

Claim:
A zoom lens comprising, in order from an object side thereof, a lens group A that includes a negative lens and a reflecting optical element for bending an optical path and remains fixed upon zooming, a lens group B that moves in one direction alone upon zooming from a wide-angle end to a telephoto end of the zoom lens, and an aperture stop that remains immovable with respect to position upon zooming, wherein condition (1) is satisfied: 0.45<log γ B /log γ<0.85 (1) where γ=f T /f W , and γ B is a magnification of the lens group B at the telephoto end/a magnification of the lens group B at the wide-angle end, provided that f W and f T are focal lengths of the zoom lens at the wide-angle end and the telephoto end, respectively.