A zoom lens, including, in order from an object side to an image side (a) a first
lens unit of negative optical power, the first lens unit consisting of, in order
from the object side to the image side, a negative lens and a positive lens, (b)
a second lens unit of positive optical power, and (c) a third lens unit of positive
optical power, wherein a separation between the first lens unit and the second
lens unit and a separation between the second lens unit and the third lens unit
are varied to effect variation of magnification, wherein, during the variation
of magnification from a wide-angle end to a telephoto end with an infinitely distant
object focused on, the third lens unit moves monotonically toward the image side
or moves with a locus convex toward the image side.