ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME

摘要

In a zoom lens including, in order from an object side: a front group including at least one lens unit; a positive lens unit; and a negative lens unit, an interval between the lens units adjacent to each other is changed during zooming, a combined focal length of the front group is negative at a wide angle end, the positive lens unit moves toward the object side during zooming from the wide angle end to a telephoto end, the negative lens unit moves toward the image side during focusing from infinity to proximity at a first zoom position, and during focusing from infinity to proximity at a second zoom position, which is on a telephoto side of the first zoom position, the positive lens unit moves toward the image side, and the negative lens unit moves toward the object side.

主权项

1. A zoom lens, comprising, in order from an object side to an image side:
a front lens group including at least one lens unit; a positive lens unit (Lp) having a positive refractive power; and a negative lens unit (Ln) having a negative refractive power, wherein an interval between the lens units adjacent to each other is changed during zooming, wherein a combined focal length of the front lens group is negative at a wide angle end, wherein the positive lens unit (Lp) moves toward the object side during zooming from the wide angle end to a telephoto end, wherein the negative lens unit (Ln) moves toward the image side during focusing from an object at infinity to an object at short distance at a first zoom position, and wherein during focusing from an object at infinity to an object at short distance at a second zoom position which is on a telephoto side of the first zoom position, the positive lens unit (Lp) moves toward the image side, and the negative lens unit (Ln) moves toward the object side.