| CPC G02B 9/12 (2013.01) | 23 Claims |
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1. An imaging lens consisting of, in order from an object side to an image side: a first lens group that has a positive refractive power; a stop; a second lens group that has a positive refractive power; and a third lens group that has a negative refractive power,
wherein during focusing, the first lens group and the third lens group remain stationary with respect to an image plane, and the second lens group moves along an optical axis,
assuming that
a sum of a distance on the optical axis from a lens surface closest to the object side in the first lens group to a lens surface closest to the image side in the third lens group and a back focal length of the imaging lens in terms of an air conversion distance is TL,
a focal length of the imaging lens in a state in which an infinite distance object is in focus is f,
a focal length of the first lens group is f1,
a maximum half angle of view in a state in which the infinite distance object is in focus is ω, and
a unit of ω is degree,
Conditional Expressions (1), (2), and (3) are satisfied, which are represented by
0<TL/f<0.64 (1),
1.5<f/f1<5 (2), and
0<ω<4 (3),
wherein a cemented lens that consists of a negative lens and a positive lens is disposed closest to the object side in the first lens group, and
assuming that
a refractive index of the positive lens of the cemented lens at a d line is N1p, and
a refractive index of the negative lens of the cemented lens at the d line is N1n,
Conditional Expression (24) is satisfied, which is represented by
−0.5<N1p−N1n<0.35 (24).
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