Patent ID: 8456750

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, wherein the first lens group comprises only one negative spherical lens and one plastic positive lens separated by an air gap; the second lens group comprises three or fewer lenses, including one positive lens component and one plastic negative lens; and the condition of the following expressions are satisfied: 0.50 <f 1 PL /(− f 2 PL )<2.50 0.80<(− f 1)/ f 2<1.35 where f 1 PL is a focal length of the plastic positive lens forming the first lens group, f 2 PL is the focal length of the plastic negative lens forming the second lens group, f 1 is the focal length of the first lens group, and f 2 is the focal length of the second lens group.