Patent ID: 8625209

Claim:
An imaging lens comprising, in order from an object side: a first lens group having negative refractive power; a second lens group having positive refractive power; and a third lens group having positive refractive power, upon focusing on a near-distance object point from an infinite-distance object point, at least one of said first lens group and said second lens group being moved so as to change a distance between said first lens group and said second lens group, and said imaging lens satisfying the following conditional expressions: 0.2<(− f 1) / f 0<1.7 0.05< X 1/ f 0<0.80 where f 1 denotes a focal length of said first lens group, f 0 denotes a focal length of the imaging lens in an infinite-distance focusing state, a moving amount given upon moving to the object side from the image side takes a positive value, and X 1 denotes a moving amount of said first lens group from the infinite-distance focusing state up to a photographic life-size maginification (magnification=−1.0) state, and wherein said first lens group includes at least one positive lens and one negative lens.