IMAGING LENS AND IMAGING APPARATUS

摘要

The imaging lens substantially consists of a first lens group, an aperture stop, a positive second lens group which is a focusing group, and a third lens group in this order from the object side. The first lens group substantially consists of a positive first sub lens group composed of a negative meniscus lens, a positive meniscus lens, and a positive lens; and a second sub lens group including a negative lens and a cemented lens, in this order from the object side. The second lens group substantially consists of a positive single lens or a cemented lens. The third lens group substantially consists of a cemented lens, a positive lens, and a negative lens in this order from the object side.

主权项

1. An imaging lens substantially consisting of three lens groups in which a first lens group which is fixed while focusing, an aperture stop, a second lens group having positive refractive power which moves toward the object side while focusing from an object at infinity to an object at the closest distance, and a third lens group which is fixed while focusing are arranged in this order from the object side;
the first lens group substantially consists of a first sub lens group having positive refractive power and a second sub lens group having negative refractive power in this order from the object side; the first sub lens group substantially consists of a negative meniscus lens with a convex surface toward the object side, a positive meniscus lens with a convex surface toward the object side, and a positive lens in this order from the object side; the second sub lens group includes a negative lens with a concave surface toward the image side, of which an absolute value of a radius of curvature on an image-side surface is smaller than that on the object side, and a cemented lens formed by cementing a negative lens and a positive lens together, in this order from the object side; the second lens group substantially consists of a positive single lens or a cemented lens formed by cementing a negative lens and a positive lens together; the third lens group substantially consists of a cemented lens formed by cementing a positive lens and a negative lens together, a positive lens, and a negative lens in this order from the object side; and conditional expressions (1) and (2) below are satisfied:
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