| CPC G02B 13/003 (2013.01) [G02B 9/10 (2013.01); G02B 9/12 (2013.01); G02B 13/0035 (2013.01)] | 20 Claims |
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1. An imaging lens comprising, successively in order from a position closest to an object side to an image side: a first lens group that has a negative refractive power; and a second lens group that has a positive refractive power,
wherein only the second lens group moves along an optical axis during focusing,
the first lens group includes, successively in order from the position closest to the object side to the image side, a first negative lens, a second negative lens, and a third negative lens, and
assuming that
an open F number in a state where an infinite distance object is in focus is FNo,
a maximum half angle of view in a state where the infinite distance object is in focus is ω,
a back focal length of the imaging lens at an air-equivalent distance in a state where the infinite distance object is in focus is Bf, and
a focal length of the imaging lens in a state where the infinite distance object is in focus is f,
Conditional Expressions (1) and (2) are satisfied, which are represented by
0.8<FNo/tan ω<1.9 (1), and
0.3<Bf/(f×tan ω)<1.2 (2).
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