Patent ID: 7286300

Claim:
A zoom lens, comprising: a first lens group having a positive refracting power; a second lens group having a negative refracting power and serving as a movable group upon power variation of said zoom lens; and a plurality of movable lens groups cooperable with said second group to form a macro lens group; wherein said first lens group, second lens group and movable lens groups are disposed in order from an object side; said movable lens groups include a single focusing group and an additional lens group disposed on the image side with respect to said single focusing group and having a negative refracting power; and said zoom lens has a macro mode in which said zoom lens can be focused at a shorter distance than an ordinary region by moving said macro lens group integrally from a position at a telephoto end toward the object side while said first lens group is fixed at the telephotograph end; wherein said ordinary region is a region where said single focusing group can focus on, upon power variations of said zoom lens; and wherein, where the focal length of the entire lens system at the wide angle end is represented by fw and the back focus at the wide angle end is represented by Twbf, the expression 0.2<|Twbf/fw|<1.2 is satisfied.