ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME

摘要

A zoom lens includes: a first lens unit having a negative refractive power; and a rear group having a positive refractive power, in which, when a focal length of the zoom lens is a shortest focal length, a maximum image height is lower than a half of a diagonal length of an image pickup region, and when a focal length of the zoom lens at which the maximum image height becomes a half of the diagonal length of the image pickup region is defined as an intermediate focal length, a focal length of the zoom lens at a longest focal length, a half angle of field of the zoom lens at the longest focal length, and other such factors are appropriately set so that the maximum image height is increased continuously from the shortest focal length to the intermediate focal length.

主权项

1. A zoom lens, which is configured to form a subject image on an image pickup element, comprising, in order from an object side to an image side:
a first lens unit having a negative refractive power; and a rear group including a plurality of lens units, wherein the rear group comprises a lens unit having a positive refractive power, wherein an interval between each pair of adjacent lens units is changed during zooming from a shortest focal length to a longest focal length, wherein the image pickup element has a rectangular image pickup region, and when a focal length of the zoom lens is the shortest focal length, a maximum image height is lower than a half of a diagonal length of the rectangular image pickup region, and there are regions in which the subject image is not formed in the image pickup region, wherein, when a focal length of the zoom lens at which the maximum image height becomes a half of the diagonal length of the image pickup region is defined as an intermediate focal length, the maximum image height is increased during zooming from the shortest focal length to the intermediate focal length, and wherein the following conditional expressions are satisfied:
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