Patent ID: 7602558
Filing Date: 2009-10-13
Classification: G02B

Abstract:
1. A zoom lens comprising: in order from an object side of the zoom lens, a first lens group having a positive power as a whole and including in order from the object side, a negative lens, a reflecting member that bends an optical path by substantially 90°, and a positive lens having biconvex shape at least one surface of which is an aspherical surface; a second lens group having a negative power as a whole and including two lenses; a third lens group having a positive power as a whole; and a fourth lens group having a positive power as a whole and including in order from the object side, a cemented lens having a negative power and a positive lens having a meniscus shape at least one surface of which is an aspherical surface and an object-side surface of which is convex, wherein the zoom lens is adapted to change a magnification thereof by moving the second lens group and forth lens group, and the zoom lens satisfies conditional equations: wherein f f ft designates a focal length at a telephoto end of the zoom lens; and vd