Patent ID: 7426080

Claim:
A zoom lens comprising: a plurality of lens units, wherein the plurality of lens units have at least one negative lens, including a first negative lens Gn 1 arranged at a position where an effective diameter is minimized among negative lenses of the zoom lens, wherein when the at least one negative lens is represented by an i th negative lens Gni indicating the i th negative lens from an expansion side toward the reduction side and Xi=θgFni−(0.6438−0.001682×νdni), the following condition is satisfied: (Σ Xi×fni )/(Σ fni )<−0.003, where the Abbe number and the partial dispersion ratio of the material of the i th negative lens Gni are νdni and θgFni, respectively, and the focal length of the i th negative lens Gni is fni.