Patent ID: 9036267
Filing Date: 2015-05-19
Classification: G02B,G03B

Abstract:
1. A zoom lens substantially consisting of four lens groups of: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, which are in this order from an object side; and a stop located between a most image-side surface of the second lens group and a most image-side surface of the third lens group, wherein distances between the lens groups change when magnification is changed from a wide angle end to a telephoto end, and wherein the second lens group consists of a negative lens, a biconcave lens and a positive lens in this order from the object side, and wherein the third lens group consists of a positive lens, a cemented lens of a positive lexis and a negative lens, a negative meniscus lens with its concave surface facing the object side, and a biconvex lens, which are in this order from the object side, and wherein the following conditional formula (1) is satisfied: R R