Patent ID: 8587878

Claim:
An image-forming lens consisting of: from an object side to an image side in the following order, a first lens group with a positive refractive power; an aperture stop; and a second lens group with a positive refractive power, and the second lens group including: from the object side to the image side in the following order, a second F lens group with a positive refractive power in which a biconvex lens and a biconcave lens are cemented to each other; a second M lens group having a concave shape on a surface on a most object side and a convex shape on a surface on a most image side; and a second R lens group of a positive lens, wherein an interval between the first lens group and the second lens group in the state of focusing on an object at infinity: A 1-2 , an interval between the first lens group and the second lens group in a case of focusing on an object in a near distance at imaging magnification − 1/20×: A 1-2M , a distance from a surface on the most image side of the second lens group to an image plane in the case of focusing on the object in the near distance at imaging magnification − 1/20×: Bf M , and a distance from the surface on the most image side of the second lens group to the image plane in the state of focusing on the object at infinity: Bf satisfy Conditional expression 11: −0.5<( A 1-2 −A 1-2 )/( Bf M −Bf )<−0.2.