Wide-Angle Objective Optical System

摘要

Excellent aberration correction, suitability for high-definition and high-pixel solid state imaging elements, a small outer diameter of an end and reduction in manufacturing cost are achieved.;A wide-angle objective optical system includes, in order from an object side to an image side: a first lens group (G1); and a second lens group (G2) having positive refractive power. The first lens group includes, in order from the object side to the image side: a first lens (L1) having negative refractive power; a second lens (L2) having a concave face as an object-side face and having negative refractive power; a brightness diaphragm (S); and a third lens (L3) having positive refractive power. The following condition expressions are satisfied:;−0.5

主权项

1. A wide-angle objective optical system comprising, in order from an object side to an image side:
a first lens group; and a second lens group having positive refractive power, wherein the first lens group comprises, in order from the object side to the image side:
a first lens having negative refractive power;a second lens having a concave face as an object-side face and having negative refractive power;a brightness diaphragm; anda third lens having positive refractive power, and following condition expressions are satisfied:
−0.5