Zoom lens and image pickup apparatus

A zoom lens comprising:

• a plurality of lens units,
• wherein the plurality of lens units include, in order from an object side to an image side,
• a first lens unit with positive refractive power that does not move for zooming,
• an intermediate group including at least three movable lens units that move for zooming, and
• a rear lens unit with positive refractive power that does not move for zooming,
• wherein each distance between adjacent lens units changes during zooming,
• wherein the first lens unit includes a focus sub-lens unit that moves for focusing,
• wherein one of the at least three movable lens units in the intermediate group includes an aperture stop, and
• wherein the following inequality is satisfied:
• 12
• ≤
• LS
• /
• fw
• ≤
• 40
• where LS is a distance on an optical axis from the aperture stop to an image plane at a wide-angle end, fw is a focal length of the zoom lens at the wide-angle end.

An image pickup apparatus comprising:

• a zoom lens;
• and
• an image sensor configured to image an object through the zoom lens,
• wherein the zoom lens includes a plurality of lens units,
• wherein the plurality of lens units include, in order from an object side to an image side,
• a first lens unit with positive refractive power that does not move for zooming,
• an intermediate group including at least three movable lens units that move for zooming, and
• a rear lens unit with positive refractive power that does not move for zooming,
• wherein each distance between adjacent lens units changes during zooming,
• wherein the first lens unit includes a focus sub-lens unit that moves for focusing,
• wherein one of the at least three movable lens units in the intermediate group includes an aperture stop, and
• wherein the following inequalities are satisfied:
• 12
• ≤
• LS
• /
• fw
• ≤
• 40
• -
• 0.15
• ≤
• fw
• /
• LP
• ≤
• -
• 0.01
• where LS is a distance on an optical axis from the aperture stop to an image plane at a wide-angle end, fw is a focal length of the zoom lens at the wide-angle end, LP is a distance on the optical axis from the image plane to an exit pupil of the zoom lens at the wide-angle end, and a direction from the image plane toward the object side is negative.