Patent ID: 7872808
Filing Date: 2011-01-18
Classification: G02B

Abstract:
1. A zoom lens system, comprising, in order from an object side to an image side: a first lens unit having positive optical power; a second lens unit having negative optical power; and a rear unit including at least one lens unit, wherein at least two lens units move during zooming so that intervals between the lens units adjacent to each other change; wherein the second lens unit consists of a negative lens component formed of at least one material and a positive lens element, which are arranged in the stated order from the object side to the image side; and wherein the following conditions are satisfied: where N 2 n represents a refractive index of the at least one material forming the negative lens component with respect to d-line, ν 2 n represents an Abbe number of the at least one material forming the negative lens component, and N 2 p represents a refractive index of a material forming the positive lens element with respect to d-line.