Patent ID: 7405887

Claim:
A zoom lens, comprising in order from object side: a first lens group comprising a reflection member for bending or folding the optical axis and having negative refractive power, the first lens group being fixed during magnification changing or adjustment operation; a second lens group having negative refractive power, the second lens group being movable in the magnification changing or adjustment operation; and a light quantity adjustment member fixed in the magnification changing or adjustment operation and serving to adjust light quantity, wherein the following formula is satisfied: 1.6 <D 12 w/fw< 5, wherein D 12 w is a distance between a most image side surface of a lens placed next to the reflection member at object side of the reflection member and a most object side surface of an entire second group, at a wide-angle end state, and wherein fw is a focal length of an entire system at the wide-angle end state.