Zoom lens and image pickup apparatus having the same

An image pickup apparatus comprising:

• a zoom lens;
• and
• an image sensor configured to receive light of an image formed by the zoom lens,
• wherein the zoom lens consists of, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a rear group including one or more lens units, wherein each distance between adjacent lens units changes during zooming,
• wherein the rear group includes a focus lens unit having a positive refractive power that moves from the image side to the object side during focusing from an infinite distance object to a close distance object,
• wherein a lens closest to the object side in the focus lens unit has a shape with a concave surface on the object side,
• wherein the lens closest to the object side in the focus lens unit has a shape with a convex surface on the image side, and
• wherein following inequalities are satisfied:
• 1.2
• <
• fLP
• /
• fL
• ⁢
• 2
• <
• 3.2
• -
• 3.
• <
• fL
• ⁢
• 1
• /
• fL
• ⁢
• 2
• <
• -
• 0.85
• where fLP represents a focal length of the focus lens unit, fL1 represents a focal length of the first lens unit, and fL2 represents a focal length of the second lens unit.