Zoom lens and image pickup apparatus including the same

摘要

A zoom lens includes, in order from an object side to an image side, first and third lens units having a positive refractive power, a second lens unit having a negative refractive power, and a rear lens group. The first lens unit is closer to the object side at a telephoto end than at a wide angle end. The second lens unit is closer to the image side at the telephoto end than at the wide angle end. A distance between the second lens unit and the third lens unit at the telephoto end, focal lengths at the wide angle end and the telephoto end, respectively, a focal length of the second lens unit, and an amount of movement of the second lens unit in an optical axis direction during zooming from the wide angle end to the telephoto end are appropriately set.

主权项

1. 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; a third lens unit having a positive refractive power; and a rear lens group including one or more lens units, wherein the first lens unit is closer to the object side at a telephoto end than at a wide angle end, and wherein, when Dt23 is a distance between the second lens unit and the third lens unit at the telephoto end, fw and ft are focal lengths of the entire zoom lens at the wide angle end and the telephoto end, respectively, f2 is a focal length of the second lens unit, f1 is a focal length of the first lens unit, the following conditional expressions are satisfied:Dt⁢⁢23fw*f⁢⁢t<0.090.01<f⁢⁢2f⁢⁢t<0.10⁢12.24≦f⁢⁢1fw<35.00.