ZOOM LENS AND IMAGE PICKUP APPARATUS

The zoom lens includes, 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, a third lens unit having a positive refractive power, a fourth lens unit having a positive refractive power, and a fifth lens unit having a negative refractive power. During zooming, the second lens unit is not moved and the first, third and fifth lens units are moved. A distance between the first and second lens units at a telephoto end is larger than that at a wide-angle end, a distance between the second and third lens units at the telephoto end is smaller than that at the wide-angle end. A condition of 0.7<f3/f4<1.5 is satisfied where f3 represents a focal length of the third lens unit, and f4 represents a focal length of the fourth lens unit.