Patent ID: 9703083
Date: 2017-07-11
CPC Classifications: G02B

Claim:
1. A zoom lens system, comprising: a first lens group of negative refractive power comprising a first lens of negative refractive power; and a second lens group of positive refractive power disposed between the first lens group and a reduced side and comprising in order from an magnified side to the reduced side a second lens of positive refractive power, a third lens of positive refractive power, a fourth lens of negative refractive power, and a fifth lens of positive refractive power, wherein at least one of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is an aspherical lens having at least one aspherical surface, wherein the condition: Exp<−33 mm is satisfied at any zoom position, where Exp denotes an exit pupil position with respect to a reduced-side paraxial image plane.