Patent ID: 7593168

Claim:
A zoom lens comprising, in order from the object side, a first lens group with a positive power, a second lens group with a negative power, a third lens group with a positive power, a fourth lens group with a positive power, a fifth lens group with a negative power, and a sixth lens group with a positive power, wherein upon zooming from a wide-angle end to telephoto end, the first lens group remains fixed relative to an image surface and at least second and fourth lens groups move, the first lens group comprises, in order from the object side, a negative lens, a reflecting optical element for bending an optical path, and a positive lens, and the following conditional expression is satisfied: 1.0 <|f 1L1 |/f w <2.5 (1) where f 1L1 is focal length of the negative lens in the first lens group, and f w is focal length at the wide-angle end; wherein the third lens group remains fixed upon zooming; and wherein the first lens group comprises, in order from the object side, a negative lens, a prism, a positive lens, and a positive lens.