Patent ID: 7602558

Claim:
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: −0.6 <f 2 /ft <−0.3 (1) 0.8 <f 4 /ft <1.5 (2) 30<vd1 (3) wherein f 2 designates a focal length of the second lens group; f 4 designates a focal length of the fourth lens group; ft designates a focal length at a telephoto end of the zoom lens; and vd 1 designates an Abbe number at the d-line of a negative lens on the most object side of the first lens group.