A zoom lens including, in order from an object side to an image side, a
first lens unit L1 of negative refractive power, a second lens unit L2 of
positive refractive power, a third lens unit L3 of negative refractive
power, and a fourth lens unit L4 of positive refractive power, wherein,
during variation of magnification from a wide-angle end to a telephoto
end, L1 moves with a locus convex toward the image side, L2 moves toward
the object side in such a way as to decrease a separation between L1 and
L2, L3 moves toward the object side in such a way as to increase a
separation between L2 and L3, and L4 moves toward the object side in such
a way as to decrease a separation between L3 and L4, and wherein the Abbe
number and refractive index of a negative lens included in L1 are
appropriately set.
