Patent ID: 6956704

Claim:
A zoom lens formed of only four lens groups, in order from the object side along an optical axis, as follows: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power; wherein the first lens group and the fourth lens group do not move during zooming; the second lens group and the third lens group are moved along the optical axis during zooming; the second lens group includes, in order from the object side along the optical axis, a first lens component having negative refractive power, a second lens component having negative refractive power, a first doublet component formed of a lens element having positive refractive power and a lens element having negative refractive power, and a second doublet component formed of a lens element having positive refractive power and a lens element having negative refractive power; and the following condition is satisfied |ν P1 −ν P2 |<5 where ν P1 is the Abbe number at the d-line of the lens element having positive refractive power of said first doublet component, and ν P2 is the Abbe number at the d-line of the lens element having positive refractive power of said second doublet component.