Patent ID: 8472126

Claim:
A zoom lens, comprising, in this order from the object-side to the image-side thereof: a first lens group of a negative refractive power, comprising, in the order from the object-side to the image-side of the zoom lens: a first lens of negative refractive power, and a second lens of positive refractive power, and a second lens group of a positive refractive power, comprising, in the order from the object-side to the image-side of the zoom lens: a third lens of positive refractive power, a fourth lens of negative refractive power, and a fifth lens of negative refractive power; and a third lens group of a positive refractive power; wherein the zoom lens satisfies the following condition formulas: R 5 /FW> 0.9, 2.6 >F 1 /FW> 2.1, 1.5 >F 2 /FW> 2, TTL/FW< 1.6, 25 >VD 2>20, 25>( VD 1 −VD 2)>20, 20>( VD 3 −VD 4)>15, 23 >VD 5>28, and ND 3>1.8, where R 5 represents a curvature radius of the object-side surface of the third lens, FW represents the effective focal length of the zoom lens which is in a wide-angle state, F 1 and F 2 are respective effective focal lengths of the first lens group and the second lens group, TTL represents a total length of the zoom lens being the sum of the thicknesses of the first lens group, the second lens group and the third lens group, VD 1 , VD 2 , VD 3 , VD 4 and VD 5 are Abbe numbers of d light of which a wavelength is about 587.6 nm in the first lens, the second lens, the third lens, the fourth lens, and the fifth lens, respectively, ND 3 represents a refractive index of the d light in the third lens.