Zoom lens and image pickup apparatus having the same

摘要

A zoom lens includes, 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, an aperture stop, a third lens unit having a positive refractive power, and a rear lens group including at least one lens unit, the first lens unit is positioned closer to the object side at a telephoto end than at a wide-angle end, the third lens unit includes at least one positive lens, and a partial dispersion ratio θgF3P of a material of one positive lens in the third lens unit, Abbe's number νd3P, focal lengths fW and fT of a total system at the wide-angle end and the telephoto end respectively, a focal length f1 of the first lens unit, and a focal length f3 of the third lens unit are appropriately set.

主权项

1. A zoom lens capable of changing a distance between adjacent lens units in zooming, the 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; an aperture stop; a third lens unit having a positive refractive power; and a rear lens group including at least one lens unit, wherein the first lens unit is positioned closer to the object side at a telephoto end than at a wide-angle end, wherein the third lens unit includes positive lenses, materials of the positive lenses included in the third lens unit satisfy the following expression:
θgF3P−(−1.665×10−7·νd3P3+5.213×10−5·νd3P2−5.656×10−3·νd3P+0.737)>050.0<νd3P<100.0, and wherein the following conditional expressions are satisfied:
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