Patent ID: 8248703

Claim:
A zoom lens comprising, in order from an object side to an image side and arranged along an optical axis thereof: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, wherein each lens unit moves during zooming from a wide-angle end to a telephoto end, wherein the first lens unit consists of two lenses, wherein the second lens unit consists of, in order from the object side to the image side: a positive lens; a positive lens; a negative lens; and a positive lens, wherein the third lens unit consists of one lens, and wherein a focal length of the entire zoom lens at the wide-angle end (fw), a focal length of the first lens unit (f 1 ), a focal length of the second lens unit (f 2 ), a focal length of the positive lens included in the second lens unit and located closest to the image side (fG 24 ), and an amount of movement (m 2 ) of the second lens unit and an amount of movement (m 3 ) of the third lens unit in a direction of the optical axis during zooming from the wide-angle end to the telephoto end satisfy the following conditions: 1.3 <|f 1 /fw|< 2.3, 1.0 <fG 24 /f 2<1.6 and −0.15 <m 3 /m 2<−0.01.