Zoom lens and image pickup apparatus including the same

An image pickup apparatus, comprising:

• a zoom lens;
• and
• an image pickup element configured to receive light of an image formed by the zoom lens,
• the zoom lens comprising in order from an object side to an image side:
• a first lens unit having a negative refractive power and being not moved for zooming;
• a second lens unit being moved during zooming, and having a positive refractive power;
• a third lens unit including an aperture stop, being not moved for zooming, and having a negative refractive power;
• a fourth lens unit being moved during zooming;
• and
• a fifth lens unit being not moved for zooming,
• wherein at least three of a lens sub unit are included in the second lens unit and the fourth lens unit, and are moved in an optical axis direction during zooming,
• wherein the following expressions are satisfied:
• 0.6<f1/f3<4.0;
• and
• 1.4<|m2|/|m41<50.0,
• where f1 and f3 respectively represent focal lengths of the first lens unit and the third lens unit, and m2 and m4 respectively represent a movement amount of one of the lens sub unit that is moved by a largest amount in the second lens unit during zooming from a wide angle end to a telephoto end and a movement amount of one of the lens sub unit that is moved by a largest amount in the fourth lens unit during zooming from the wide angle end to the telephoto end.