ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME

摘要

A zoom lens including: a positive first lens unit; a negative second lens unit; and a positive rear lens group, an interval of adjacent lens units is changed during zooming, the rear lens group includes from an object side: a positive lens system; an aperture stop; and a negative partial lens system, the first lens unit and the aperture stop are positioned closer to the object side at a telephoto end than at a wide angle end, and a combined focal length of a front lens system between the first lens unit and the aperture stop at the wide angle end, an absolute value of a distance on an optical axis from a first lens surface to the aperture stop at the wide angle end, a focal length of the first lens unit, and a focal length of the zoom lens at the wide angle end is 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; and a rear lens group including at least one lens unit, wherein an interval between each pair of adjacent lens units is changed during zooming, wherein a refractive power of the rear lens group is positive over an entire zoom range, wherein the rear lens group includes:
a partial lens system LRp1 having a positive refractive power closest to the object side;an aperture stop on the image side of the partial lens system LRp1; andat least one partial lens system having a negative refractive power between the aperture stop and an image plane, wherein the first lens unit and the aperture stop are configured to be positioned closer to the object side at a telephoto end than at a wide angle end, and wherein the following conditional expressions are satisfied:
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