Zoom lens and image pickup apparatus

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, 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 three or more 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 intermediate group includes, in order from the object side to the image side:
• a first intermediate negative lens unit that includes a single lens unit or two or more partial lens units and having negative refractive power as a whole that moves monotonically toward the image side during zooming from a wide-angle end to a telephoto end,
• a second intermediate negative lens unit having negative refractive power that moves during zooming, and
• an intermediate positive lens unit having positive refractive power that moves during zooming, and
• wherein at least one of lens units having negative refractive power disposed in the intermediate group moves in a convex locus toward the object side during zooming from the wide-angle end to the telephoto end, and
• wherein the following inequalities are satisfied:
• 4.
• ≤
• ft
• /
• f
• ⁢
• 1
• ≤
• 8.
• -
• 9.
• ⁢
• 0
• ≤
• f
• ⁢
• 1
• /
• fv
• ≤
• -
• 5
• .
• 5
• ⁢
• 0
• where fl is a focal length of the first lens unit, fv is a focal length of the first intermediate negative lens unit, and ft is a focal length of the zoom lens at the telephoto end.