Patent ID: 8792182

Claim:
A zoom lens comprising: a first lens unit having a positive refractive power, a second lens unit having a negative reflective power, a third lens unit having a positive refractive power, and a rear lens group including one or more lens units in this order from an object side to an image side, wherein distances between the respective lens units vary during the zooming operation, wherein the first lens unit consists of three lenses including one negative lens, and where θgF is a partial dispersion ratio of a material for the negative lens of the first lens unit, νd is an Abbe number of the same, fW is a focal length of the entire system at the wide angle end, and f1 is a focal length of the first lens unit, conditions of 35.0 <νd< 50.0 0.52 <θgF θ gF<− 0.00203 ×νd+ 0.656 18.1 <f 1 /fW< 27.8 are satisfied.