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 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 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;
• a fifth lens unit having a negative refractive power;
• and
• a rear lens group including one or more lens units,
• wherein the third lens unit is configured to move toward the object side during zooming from a wide angle end to a telephoto end,
• wherein an interval between each pair of adjacent lens units is changed during zooming,
• wherein the fourth lens unit is configured to move in a direction having a vertical component with respect to an optical axis during image stabilization, and
• wherein the following conditional expression is satisfied:
• 1.2<f4/f3<3.0,
• where f3 represents a focal length of the third lens unit, and f4 represents a focal length of the fourth lens unit.