Patent ID: 7505212

Claim:
A zoom lens having a plurality of lens groups which performs zooming by changing distances between groups, comprising: a reflective member to bend an optical axis which passes through the plurality of the lens groups, wherein the plurality of lens groups includes, in order from an object side to an image plane side, a first lens group having a positive refractive power and fixed in position, a second lens group having a negative refractive power and to be moved along the optical axis direction when zooming, a third lens group having a positive refractive power and fixed in position, a fourth lens group having a positive refractive power and to be moved in the optical axis direction to compensate a position change of the image plane when zooming and focusing, and a fifth lens group having a negative refractive power and fixed in position when zooming, and the zoom lens satisfies a following conditional expression (1); 3.4 <f 3 /fw <4.0 (1) where f3: focal distance of the third lens group; and fw: focal distance at a maximum wide angle state of whole lens system.