Zoom lens and image pickup apparatus including the same

A 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;
• and
• a fourth lens unit having a positive refractive power,
• wherein, during zooming, the first lens unit is configured not to move, and the second lens unit, the third lens unit, and the fourth lens unit are configured to move,
• wherein the third lens unit comprises, in order from the object side to the image side, a first lens subunit and a second lens subunit each having a positive refractive power, the second lens subunit is configured to move in a direction having a component of a direction perpendicular to an optical axis during image blur correction, the first lens subunit-comprises at least one positive lens and at least one negative lens, and the second lens subunit comprises a positive lens and a negative lens;
• and
• wherein the following conditional expressions are satisfied:
• −3.9<f3/f2<−2.2,
• 0.9<f3b/f3<1.6, and
• 0.7<(T1m/fm)/(T1w/fw)<1.2,
• where f2 represents a focal length of the second lens unit, f3 represents a focal length of the third lens unit, and f3b represents a focal length of the second lens subunit, fw represents a focal length of the zoom lens at a wide angle end, T1w represents an entrance pupil position at the wide angle end, fm represents a focal length of the zoom lens at an intermediate zoom position, and T1m represents an entrance pupil position at the intermediate zoom position.

A 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 and comprising, in order from the object side to the image side:
• a first lens subunit and a second lens subunit each having a positive refractive power, the second lens subunit being configured to move in a direction having a component of a direction perpendicular to an optical axis during image blur correction, the third lens unit comprising at least two positive lenses and at least two negative lenses, and the second lens subunit comprising a positive lens and a negative lens;
• a fourth lens unit having a positive refractive power;
• and
• an aperture stop arranged between the second lens unit and the third lens unit,
• wherein, during zooming, the first lens unit and the aperture stop being configured not to move and, the second lens unit, the third lens unit, and the fourth lens unit are configured to move,
• wherein the following conditional expressions are satisfied:
• −3.9<f3/f2<−2.2
• 0.9<f3b/f3<1.6
• where f2 represents a focal length of the second lens unit, f3 represents a focal length of the third lens unit, and f3b represents a focal length of the second lens subunit.