Patent ID: 7016118

Claim:
A zoom lens comprising, in order from a front side to a rear side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a negative refractive power; a fifth lens unit; and a sixth lens unit having a positive refractive power, the sixth lens unit including at least one positive lens element, wherein at least four lens units move during zooming from a wide-angle end to a telephoto end and the zoom lens satisfies the following conditions: 0.00 <o 1 / L 1 <0.38 −0.015 <θgF −(0.6438–0.001682 νd )<0.04 where o 1 represents a distance from a surface vertex on the most front side of the first lens unit to a position of a principal plane on the front side, L 1 represents an overall length of the first lens unit, νd represents an average Abbe number of a material of the at least one positive lens element of the sixth lens unit and is defined as νd=(nd−1)/(nF−nC), θgF represents an average partial dispersion ratio of a material of the at least one positive lens element of the sixth lens unit and is defined as θgF=(ng−nF)/(nF−nC), and ng, nd, nF, nC represent refractive indices of the material with g-, d-, F-, C-lines.