Patent ID: 8405917

Claim:
A zoom lens, comprising: in order from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power, the second lens group including, in order from the object side, a first negative lens and a cemented lens including a second negative lens having a convex shape on the object side and a positive lens; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; and an aperture stop arranged between the second lens group and the third lens group, wherein when changing a magnification from a short focal end to a telephoto focal end, an interval between the first lens group and the second lens group is increased, an interval between the second lens group and the third lens group is decreased, an interval between the third lens group and the fourth lens group is increased, and the first lens group and the third lens group is moved to be located closer to the object side at the telephoto focal end than the short focal end; and wherein the following conditional expression is satisfied where an interval between the second lens group and the aperture stop at the short focal end is D 2 Sw and an interval between the aperture stop and the third lens group at the short focal end is DS 3 w; 0.3 <DS 3 w/D 2 Sw< 2.0.