Patent ID: 8363331

Claim:
A zoom lens comprising: a first lens unit provided nearest to an enlargement conjugate side and having a negative refractive power; and a final lens unit provided at nearest to a reduction conjugate side and having a positive refractive power, the final lens unit including a cemented lens provided nearest to the reduction conjugate side, the cemented lens having a positive refractive power and including a positive lens element and a negative lens element, wherein the zoom lens satisfies the following conditions: ν N −ν P >0 n N −n P >0 2.0< fe/fw< 4.74 where n P and ν P denote a refractive index and an Abbe number, respectively, of the positive lens element; n N and ν N denote a refractive index and an Abbe number, respectively, of the negative lens element; fe denotes a focal length of the final lens unit; and fw denotes a focal length of the zoom lens at a wide-angle end.