Patent ID: 8503093

Claim:
A zoom lens comprising, in order from an object: a first lens group having negative refractive power; a second lens group having positive refractive power; and a third lens group having positive refractive power, at least the first lens group and the second lens group moving along the optical axis respectively upon zooming from a wide-angle end state to a telephoto end state, the first lens group including, in order from the object, a first lens having negative refractive power and .a second lens having positive refractive power, and the second lens being a plastic lens having an aspherical surface, the second lens group including, in order from the object, a third lens having positive refractive power, a fourth lens and a fifth lens, and one of the fourth lens and the fifth lens being a negative lens and the other a positive lens, the third lens group including a sixth lens having positive refractive power, and the following conditional expressions being satisfied respectively: 1.50<(− f 1)/ fw< 2.52 0.4<(− f 1)/ fL 2<0.8 n 2 ×n 2×ν2<77.0 where f1 denotes a focal length of the first lens group, fw denotes a focal length of the zoom lens in the wide-angle end state, fL2 denotes a focal length of the seconds lens, n2 denotes a refractive index of the second lens, and ν2 denotes an Abbe number of the second lens.