Zoom lens and image pickup apparatus equipped with the same

摘要

A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, and a third lens unit having positive refractive power. A distance between every adjacent ones of the first to third lens units varies during zooming. The second lens unit includes, in order from the object side to the image side, a positive lens and a cemented lens in which a positive lens and a negative lens are cemented. A focal length (f2) of the second lens unit, a focal length (fT) of the entire zoom lens at a telephoto end, and an average refractive index (Npave) of materials of the positive lenses included in the entire zoom lens 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 negative refractive power; a second lens unit having positive refractive power; and a third lens unit having positive refractive power, wherein a distance between every adjacent ones of the first to third lens units varies during zooming, wherein the second lens unit includes, in order from the object side to the image side, a positive lens and a cemented lens in which a positive lens and a negative lens are cemented, and wherein the following conditions are satisfied:
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