Patent ID: 8665528

Claim:
A zoom lens comprising, in order from an object side to an image side, a first lens unit of a negative refractive power, a second lens unit of a positive refractive power, and a third lens unit of a positive refractive power, an interval between the first lens unit and the second lens unit and an interval between the second lens unit and the third lens unit being configured to change in zooming from a wide angle end to a telephoto end, wherein the first lens unit includes, in order from the object side to the image side, a negative lens, and a positive lens, wherein the following expressions are satisfied: −0.6 <f 1/ fT<− 0.1 0.020<(θ g,F 11 −θg,F 12)/(ν d 11 −νd 12)<−0.004 15 <νd 11 −νd 12<40 where νd11 is an Abbe number of a material of the negative lens, θg,F11 is a partial dispersion ratio of the material of the negative lens, νd12 is an Abbe number of a material of the positive lens, θg,F12 is a partial dispersion ratio of the material of the positive lens, f 1 is a focal length of the first lens unit, and fT is a focal length of an entire zoom lens at the telephoto end.