Patent ID: 8736971
Filing Date: 2014-05-27
Classification: G02B,H04N

Abstract:
1. A zoom lens comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; and a rear lens group including a plurality of lens units and as a whole having a positive refractive power, wherein distances between adjacent ones of the lens units change during zooming, wherein the second lens unit includes, in order from the object side to the image side, wherein the second lens unit includes at least five lens components, and wherein the zoom lens satisfies the following conditional expressions: where f 1 denotes a focal length of the first lens unit, f 2 denotes a focal length of the second lens unit, Ndp denotes a refractive index of the positive lens component of the cemented lens, and Ndn denotes a refractive index of the negative lens component of the cemented lens.