Patent ID: 9568715
Date: 2017-02-14
CPC Classifications: G02B

Claim:
1. A zoom lens consisting of, in order from the object side: a first lens group having positive refractive power, and which is fixed during magnification change; a second lens group having negative refractive power, and which moves during magnification change; a third lens group having positive refractive power, and which is fixed during magnification change; a fourth lens group having positive refractive power, and which moves during magnification change; and a fifth lens group having negative refractive power, and which moves during magnification change, wherein the first lens group consists of, in order from the object side, a front group having negative refractive power, a reflection member that bends an optical path and a rear group having positive refractive power, and wherein the fourth lens group includes at least a cemented lens of a positive lens and a negative lens, and wherein the following conditional expressions (1) and (5) are satisfied: IH is a maximum image height, fw is a focal length at a wide angle end, νd4p is an Abbe number of the positive lens constituting the cemented lens in the fourth lens group, and νd4n is an Abbe number of the negative lens constituting the cemented lens in the fourth lens group.