Importance

Loading Importance Indicators...

Abstract

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:

description='In-line Formulae' end='lead'0.15<f1/f2<0.60  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'2.5<f2/f<7.0  (2), wheredescription='In-line Formulae' end='tail'

f1: the focal length of the first lens group,

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.

Loading the Abstract Image...

First Claim