Patent ID: 7505214

Claim:
A zoom lens comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; and an image-side lens unit, wherein an interval between the first lens unit and the second lens unit varies during zooming, wherein the first lens unit includes an optical element having a positive refractive power and made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition: 0.755 <θgF −(−1.665×10 −7 ·νd 3 +5.213×10 −5 ·νd 2 −5.656×10 −3 ·νd )<1.011, wherein a focal length of the first lens unit (f 1 ) and a focal length of the zoom lens at a telephoto end (ft) satisfy the following condition: 1.6<( ft/f 1) 2 <5.6, and wherein a focal length of the optical element (fGIT) in a case where both of two refractive surfaces of the optical element are in contact with air satisfies the following condition: 5< fGIT/f 1<80.