Lens apparatus and image pickup apparatus including the same

摘要

A lens apparatus includes, in order from an object side: a first lens unit; an aperture stop; and a positive second lens unit. The first lens unit includes, in order from the object side, a first negative lens, a second negative lens having at least one aspheric surface, and a positive lens. The second lens unit includes at least one negative lens and at least two positive lenses. The first and second negative lenses of the first lens unit are meniscus lenses having a surface convex toward the object side. The focal length of the optical system, the focal lengths of the first and second lens units, the mean values of Abbe constants of the positive lens and the negative lenses of the first lens unit, and the mean values of Abbe constants of the positive lenses and the negative lenses of the second lens unit are appropriately configured.

主权项

1. A lens apparatus, comprising an optical system that comprises, in order from an object side to an image side: a first lens unit; an aperture stop; and a second lens unit having a positive refractive power,
wherein the first lens unit comprises, in order from the object side to the image side, a first negative lens, a second negative lens, and a positive lens, and the second lens unit comprises at least one negative lens and at least two positive lenses, the first negative lens and the second negative lens of the first lens unit are meniscus lenses having a surface convex toward the object side, the second negative lens of the first lens unit has at least one aspheric surface, and
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