Patent ID: 9395523
Filing Date: 2016-07-19
CPC Classification: G02B

Claim Text:
1. A zoom lens consisting of four or five lens groups as a whole, which consist of, in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, one or two middle lens groups including a mp lens group having a positive refractive power, and a rearmost lens group disposed at the most image side position of the entire system and having a positive refractive power, wherein magnification change is effected by changing all distances between the adjacent lens groups, an A cemented lens consisting of a positive lens and a negative lens which are cemented together in this order from the object side is disposed at the most object-side position of the second lens group, a B cemented lens consisting of one positive lens and one negative lens is disposed on the image side of the A cemented lens and on the object side of the mp lens group, a C cemented lens consisting of one positive lens and one negative lens is disposed in the mp lens group, and the condition expressions (1) and (2) below are satisfied: where νdBn is an Abbe number of the negative lens forming the B cemented lens, and θgFBn is a partial dispersion ratio of the negative lens forming the B cemented lens.