Patent ID: 7715118

Claim:
A macro lens system comprises a positive first lens group, a diaphragm, a positive second lens group, and a negative third lens group, in this order from an object, wherein upon focusing from an object at an infinite distance to an object at a closer distance, said positive first lens group and said positive second lens group integrally move toward the object without changing a distance therebetween, with respect to said negative third lens group which is stationary with respect to an imaging plane in a camera body; wherein said positive first lens group comprises a negative first sub-lens group and a positive second sub-lens group which are divided at a maximum distance between lens elements in said positive first lens group; and wherein said a macro lens system satisfies the following conditions: 0.32<d/f<0.7 −10<f3/f<−6 wherein d designates an distance between said negative first sub-lens group and said positive second sub-lens group; f designates a focal length of the entire macro lens system; and f 3 designates a focal length of said negative third lens group.