Patent ID: 7760440

Claim:
A zoom lens comprising: a first lens group that has positive refractive power and is constituted by a plurality of lenses including at least one aspherical surface, and is arranged at the furthest object side; a second lens group that has negative refractive power and is arranged at the image side of the first lens group; a third lens group that has positive refractive power and is arranged at the image side of the second lens group; and a fourth lens group that is used for focusing, has positive refractive power and is arranged at the furthest image side; wherein the first lens group is, in order from the object side towards the image side, constituted by a first lens, a second lens and a plurality of lenses, wherein the first lens is a concave lens having concave surface that faces to the image side, and the second lens is a meniscus lens having at least one surface formed in a meniscus shape.