Zoom lens and image pickup apparatus having the same

A zoom lens comprising, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear group having a positive refractive power as a whole, including at least one lens unit,

• wherein a distance between the first lens unit and the rear group is changed during zooming,
• wherein the rear group includes a subunit that is moved in a direction having a component of a direction orthogonal to an optical axis during image stabilization,
• wherein the subunit includes a positive lens and a negative lens,
• wherein the first lens unit includes, in order from the object side to the image side, two or more negative lenses,
• wherein a lens surface of the lens A on the object side is concave toward the object side,
• wherein a lens surface of the lens A on the image side is concave toward the object side, and
• wherein the following inequalities are satisfied:
• -
• 20
• <
• Dist_w
• <
• -
• 8
• -
• 0.4
• <
• fl
• /
• fLN
• ≦
• -
• 0.2
• 1.
• ❘
• "\[LeftBracketingBar]"
• fLIS
• /
• ft
• |
• ≦
• 2
• .
• 9
• ⁢
• 1
• -
• 2.2
• <
• fl
• /
• skw
• ≦
• 1
• .16
• ,
• -
• 1.5
• <
• Ymax_w
• /
• fl
• <
• -
• 0.5
• ;
• where
• Dist_w
• ⁢
• is
• ⁢
• a
• ⁢
• distortion
• ⁢
• amount
• ⁢
• at
• ⁢
• a
• maximum image height in an in-focus state at infinity at a wide-angle end, f1 is a focal length of the first lens unit, fLN is a focal length of a final lens unit closest to an image plane, fLIS is a focal length of the subunit, and ft is a focal length of the zoom lens at the telephoto end, skw is a backfocus of the zoom lens at the wide-angle end, and Ymax_w is a maximum image height at the wide-angle end.

An image pickup apparatus comprising:

• a zoom lens;
• and
• an image sensor configured to receive an image formed by the zoom lens,
• wherein the zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear group having a positive refractive power as a whole, including at least one lens unit,
• wherein a distance between the first lens unit and the rear group is changed during zooming,
• wherein the rear group includes a subunit that is moved in a direction having a component of a direction orthogonal to an optical axis during image stabilization,
• wherein the subunit includes a positive lens and a negative lens,
• wherein the first lens unit includes, in order from the object side to the image side, two or more negative lenses,
• wherein a lens surface of the lens A on the object side is concave toward the object side,
• wherein a lens surface of the lens A on the image side is concave toward the object side, and
• wherein the following inequalities are satisfied:
• -
• 20
• <
• Dist_w
• <
• -
• 8
• -
• 0.4
• <
• fl
• /
• fLN
• ≦
• -
• 0.2
• 1.
• <
• ❘
• "\[LeftBracketingBar]"
• fLIS
• /
• ft
• ❘
• "\[RightBracketingBar]"
• ≦
• 2.91
• -
• 2.2
• <
• fl
• /
• skw
• ≦
• -
• 1.16
• ,
• and
• -
• 1.5
• <
• Ymax_w
• /
• fl
• <
• -
• 0.5
• ;
• where Dist_w is a distortion amount at a maximum image height in an in-focus state at infinity at a wide-angle end, f1 is a focal length of the first lens unit, fLN is a focal length of a final lens unit closest to an image plane, fLIS is a focal length of the subunit, and ft is a focal length of the zoom lens at the telephoto end, skw is a backfocus of the zoom lens at the wide-angle end, and Ymax_w is a maximum image height at the wide-angle end.