WIDE ANGLE LENS AND IMAGING APPARATUS

摘要

A wide angle lens consists of a negative first lens group, a positive second lens group, a stop, and a positive third lens group in order from the object side. The first lens group includes two negative meniscus lenses, each with a convex surface on the object side. The second lens group includes one pair of cemented lenses. The third lens group includes two pairs of cemented lenses and at least one aspherical surface.

主权项

1. A wide angle lens, consisting essentially of a first lens group having a negative refractive power, a second lens group having a positive refractive power, a stop, and a third lens group having a positive refractive power, in order from the object side, wherein:
the first lens group includes two negative meniscus lenses, each with a convex surface on the object side; the second lens group is composed of a cemented lens formed by cementing a positive lens having a biconvex shape and a negative lens with a concave surface on the object side in this order from the object side; and the third lens group is composed, in order from the object side, of a cemented lens, a positive lens, an aspherical lens, and a cemented lens formed by cementing a negative lens with a concave surface on the image side and a positive lens having a biconvex shape in this order from the object side.