Zoom lens and image pickup apparatus

A zoom lens comprising a plurality of lens units, wherein the plurality of lens units consists of in order from an object side to an image side:

• a front lens unit having a positive refractive power and configured not to move for zooming;
• a plurality of moving lens units, including two lens units having negative refractive powers, configured to move for zooming;
• and
• a rear lens unit having a positive refractive power and configured not to move for zooming,
• wherein conditional expressions
• 2.7<|f2n/fr|<6.0;
• 0.5<|ff/f1n|<2.3;
• and
• 0.05<BF/Lr<0.35
• are satisfied where ff is a focal length of the front lens unit, f1n is a focal length of a lens unit arranged closest to the object side of all negative lens units in the plurality of moving lens units, f2n is a focal length of a lens unit arranged closest to the image side of all negative lens units in the plurality of moving lens units, fr is a focal length of the rear lens unit, Lr is a distance from a vertex of a surface, on the object side, of a lens closest to the object side in the rear lens unit to an image plane, and BF is a distance from a vertex of a surface, on the image side, of a lens closest to the image side in the rear lens unit to the image plane.

A zoom lens comprising a plurality of lens units, wherein the plurality of lens units consists of in order from an object side to an image side:

• a front lens unit having a positive refractive power and configured not to move for zooming;
• a plurality of moving lens units, including two lens units having negative refractive powers, configured to move for zooming;
• and
• a rear lens unit having a positive refractive power and configured not to move for zooming,
• wherein the rear lens unit has a front principal point located on the object side with respect to a vertex of a surface, on the object side, of a lens closest to the object side in the rear lens unit, and
• wherein conditional expressions
• 2.7<|f2n/fr|<6.0;
• 0.5<|ff/f1n|<2.3;
• and
• 0.08<o1r/Lr<0.20
• are satisfied where ff is a focal length of the front lens unit, f1n is a focal length of a lens unit arranged closest to the object side of all negative lens units in the plurality of moving lens units, f2n is a focal length of a lens unit arranged closest to the image side of all negative lens units in the plurality of moving lens units, fr is a focal length of the rear lens unit, o1r is a distance from the vertex of the surface to the front principal point, and Lr is a distance from the vertex of the surface to an image plane.

A zoom lens consisting of in order from an object side to an image side:

• a front lens unit having a positive refractive power and configured not to move for zooming;
• a plurality of moving lens units, including two lens units having negative refractive powers, configured to move for zooming;
• and
• a rear lens unit having a positive refractive power and configured not to move for zooming,
• wherein the rear lens unit consists of a front lens sub-unit having a positive refractive power and a rear lens sub-unit having a negative refractive power with a largest gap therebetween in the rear lens unit, and
• wherein conditional expressions
• 2.7<|f2n/fr|<6.0;
• 0.5<|ff/f1n|<2.3;
• and
• 0.1<|frp/frn|<0.7
• are satisfied where ff is a focal length of the front lens unit, f1n is a focal length of a lens unit arranged closest to the object side of all negative lens units in the plurality of moving lens units, f2n is a focal length of a lens unit arranged closest to the image side of all negative lens units in the plurality of moving lens units, fr is a focal length of the rear lens unit, frp is a focal length of the front lens sub-unit, and frn is a focal length of the rear lens sub-unit.