Patent ID: 8941926
Filing Date: 2015-01-27
Classification: G02B,H04N

Abstract:
1. A zoom lens comprising in order from an object side: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a negative refractive power; a fourth lens group having a positive refractive power; a fifth lens group having a positive refractive power; and a last lens group having a positive refractive power, wherein at the time of zooming from a wide angle end to a telephoto end, the second lens group and the third lens group move, and one of the fourth lens group, the fifth lens group, and the last lens group moves, wherein the zoom lens satisfies the following conditional expression: where β23W denotes a combined magnification of the second lens group and the third lens group, at the wide angle end, and is a magnification at the time of infinite object point focusing.