Patent ID: 9557536
Date: 2017-01-31
CPC Classifications: G02B

Claim:
1. A zoom lens comprising at least a first lens group having a negative refractive power and a second lens group having a positive refractive power in order from an object side and performing magnification change by changing an interval between each of the lens groups, wherein an interval between the first lens group and the second lens group is reduced by magnification change from a wide-angle end to a telephoto end; wherein the first lens group includes a catoptric element having a function of bending an optical path by reflecting a light ray; wherein the second lens group includes a cemented lens obtained by cementing three lenses, and a lens having a positive refractive power, a lens having a negative refractive power, and a lens having a positive refractive power in order from the object side; and wherein the following conditions are satisfied: where n 21 is a refractive index of a lens on a side closest to an object in the second lens group, n 2 p 1 is a refractive index of the lens having the positive refractive power on the object side in the second lens group, and n 2 n is a refractive index of the lens having the negative refractive power in the second lens group.