Zoom lens and image pickup apparatus having the same

摘要

A zoom lens including: a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power in this order from an object side to an image side. During zooming, the lens units move such that an interval between adjacent lens units varies. The third lens unit includes at least two positive lenses. A partial dispersion ratio (θgF3P) of a material and the Abbe number (νd3P) of a positive lens included in the third lens unit satisfy the following conditional expressions,
θgF3P−(−1.665×10−7·νd3P3+5.213×10−5·νd3P2−5.656×10−3·νd3P+0.737)>050.0<νd3P<100.0.

主权项

1. A zoom lens comprising:
a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power in this order from an object side to an image side, wherein, during zooming, the lens units move along predetermined loci such that an interval between adjacent lens units varies, and the first lens unit and the third lens unit move toward the object side at a telephoto end in comparison with a wide angle end, wherein the third lens unit includes at least two positive lenses formed of a material which satisfies the following conditional expressions,
θgF3P−(−1.665×10−7·νd3P3+5.213×10−5·νd3P2−5.656×10−3·νd3P+0.737)>050.0<νd3P<100.0where θgF3P is a partial dispersion ratio of the material and νd3P is the Abbe number of the positive lens included in the third lens unit, and
wherein the zoom lens satisfies the following conditional expressions
0.01