| 主权项 |
1. A zoom lens comprising, sequentially from an enlargement conjugate side to a reduction conjugate side:
a first lens unit having negative refractive power that is not moved during zooming; plural lens units that are moved during zooming; and a final lens unit having positive refractive power that is not moved during zooming, wherein a final moving lens unit having positive refractive power and disposed nearest to the reduction conjugate side among the plural lens units that are moved during zooming is moved toward the enlargement conjugate side during zooming from a wide angle end to a telephoto end, and the final moving lens unit includes one or more cemented lenses, and the final moving lens unit includes one or more negative lenses and one or more positive lenses; and the following conditions are satisfied:
5.00<f/fw |nn−np|<0.0800.0<νn−νp where f is a focal length of the final moving lens unit; fw is a focal length of the zoom lens at a wide angle end; nn and νn are respectively an average refractive index and an average Abbe number of a material of one negative lens that is included in the final moving lens unit; and np and νp are respectively an average refractive index and an average Abbe number of a material of one positive lens that is included in the final moving lens unit, provided that, when a refractive index for C-line is denoted by NC, a refractive index for d-line is denoted by Nd, and a refractive index for F-line is denoted by NF, the Abbe number ν=(Nd−1)/(NF−NC). |
