Patent ID: 7746563

Claim:
A large magnification factor zoom lens comprising: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a fourth lens group having a positive refractive power, wherein the first lens group, the second lens group, and the third lens group are arranged in an order from an object side, and the large magnification factor zoom lens is configured so as to satisfy the following conditional expressions including 0.35 ≦f 1 /f t ≦0.45 0.6≦| f 2 |/f w ≦0.8 0.15 ≦f 3 /f t ≦0.3 6.08≦2ω( t )≦7.82 where f 1 represents a focal length of the first lens group, f 2 represents a focal length of the second lens group, f 3 represents a focal length of the third lens group, f t represents the focal length of an entire zoom lens system at a telephoto end, f w represents a focal length of the entire zoom lens system at a wide-angle end, and 2ω(t) represents angle of view of the entire zoom lens system at the telephoto end.