Patent ID: 8970966
Filing Date: 2015-03-03
Classification: G02B,H04N

Abstract:
1. An optical system comprising, in order from an object side to an image side, a first lens unit of a positive refractive power, an aperture diaphragm, and a second lens unit of a positive refractive power, wherein the first lens unit includes, in order from the object side to the image side, a cemented lens Lp wherein the following conditional expressions are satisfied: where n 11 and νd 11 are a refractive index and an Abbe number of a material of the first lens, n 12 and νd 12 are a refractive index and an Abbe number of a material of the second lens, fp 1 is a focal length of the cemented lens Lp 1 , and f is a focal length of an entire optical system.