Patent ID: 8755126

Claim:
A zoom lens comprising, in order from an object side to an image side: a first lens unit having a positive refractive power that does not move for zooming; a second lens unit having a negative refractive power that moves during zooming; a third lens unit having a negative refractive power that moves during zooming; a fourth lens unit having a positive refractive power that moves during zooming; and a fifth lens unit having a positive refractive power that does not move for zooming, wherein the zoom lens satisfies the following conditional expressions, 1.50< L 2 w/L 2 z 1 a< 1600.00, 0.05< L 2 w/L 3 w< 0.60, and −14.50< f 1/ f 23 w<− 10.00, where L 2 w denotes an air interval between the second lens unit and the third lens unit at a wide-angle end, L 3 w denotes an air interval between the third lens unit and the fourth lens unit at the wide-angle end, f 1 denotes a focal length of the first lens unit, f 23 w denotes a combined focal length of the second lens unit and the third lens unit at the wide-angle end, Z denotes a zoom ratio, and L 2 z 1 a denotes a smallest value of the air interval between the second lens unit and the third lens unit in a zoom range in which a magnification-varying ratio relative to that at the wide-angle end ranges from Z 0.02 to Z 0.35 .