SUPER WIDE ANGLE LENS AND IMAGING APPARATUS

摘要

This super-wide lens substantially consists of a positive first lens group, a positive second lens group, and a negative third lens group, in this order from the object side. The first lens group and the third lens group are fixed and the second lens group moves toward the object side while focusing from an object at infinity to an object at the closest distance. The first lens group substantially consists of a negative first sub lens group, a positive second sub lens group, an aperture stop, and a positive third sub lens group in this order from the object side. Conditional expressions (1) and (2) are satisfied:;0.15
f2: the focal length of the second lens group, and

f: the focal length of the entire system when focusing on an object at infinity.

主权项

1. A super-wide-angle lens substantially consisting of three lens groups which are a first lens group having positive refractive power, a second lens group having refractive power, and a third lens group having negative refractive power arranged in this order from the object side;
the first lens group and the third lens group are fixed and the second lens group moves toward the object side while focusing from an object at infinity to an object at the closest distance; the first lens group substantially consists of a first sub lens group having negative refractive power, a second sub lens group having positive refractive power, an aperture stop, and a third sub lens group having positive refractive power in this order from the object side; the second lens group is composed of a cemented lens formed by cementing a positive lens and a negative lens together; and conditional expressions (1) and (2) are satisfied:
0.15