Zoom lens and image pickup apparatus

A zoom lens comprising, in order from an object side to an image side:

• a first lens unit having positive refractive power and fixed for zooming;
• a second lens unit having negative refractive power and configured to move during zooming;
• at least two lens units configured to move during zooming;
• a final lens unit having positive refractive power, disposed closest to an image plane, and fixed for zooming;
• and
• an aperture stop disposed between a lens surface closest to the image plane of the second lens unit and a lens surface closest to an object of the final lens unit, configured to move during zooming, and located closer to the image plane at a telephoto end than at a wide-angle end,
• wherein the first lens unit includes a sub-lens unit disposed closest to the object in the first lens unit and fixed for focusing, and a sub-lens unit configured to move for focusing,
• wherein the second lens unit includes a first negative lens closest to the object in the second lens unit, at least one negative lens other than the first negative lens, and at least one positive lens,
• wherein the at least two lens units configured to move during zooming include, in order from the object side to the image side, a third lens unit having negative refractive power, and at least one lens unit, and
• wherein the following inequalities are satisfied:
• 6
• ⁢
• 0
• ≤
• v
• ⁢
• d
• ⁢
• 2
• ⁢
• 1
• ≤
• 105
• 30
• ≤
• vd
• ⁢
• 2
• ⁢
• Nave
• ≤
• 65
• where νd21 is an Abbe number of a material of the first negative lens based on d-line, and νd2Nave is an average Abbe number of a material of the at least one negative lens other than the first negative lens in the second lens unit.

A zoom lens comprising, in order from an object side to an image side:

• a first lens unit having positive refractive power and fixed for zooming;
• a second lens unit having negative refractive power and configured to move during zooming;
• at least two lens units configured to move during zooming;
• a final lens unit having positive refractive power, disposed closest to an image plane, and fixed for zooming;
• and
• an aperture stop disposed between a lens surface closest to the image plane of the second lens unit and a lens surface closest to an object of the final lens unit, configured to move during zooming, and located closer to the image plane at a telephoto end than at a wide-angle end,
• wherein the first lens unit includes a sub-lens unit disposed closest to the object in the first lens unit and fixed for focusing, and a sub-lens unit configured to move for focusing,
• wherein the second lens unit includes a first negative lens closest to the object in the second lens unit, at least one negative lens other than the first negative lens, and at least one positive lens,
• wherein the at least two lens units configured to move during zooming include, in order from the object side to the image side, a third lens unit having negative refractive power, and a fourth lens unit having positive refractive power, and
• wherein the following inequalities are satisfied:
• 6
• ⁢
• 0
• ≤
• v
• ⁢
• d
• ⁢
• 2
• ⁢
• 1
• ≤
• 105
• 30
• ≤
• vd
• ⁢
• 2
• ⁢
• Nave
• ≤
• 65
• where νd21 is an Abbe number of a material of the first negative lens based on d-line, and νd2Nave is an average Abbe number of a material of the at least one negative lens other than the first negative lens in the second lens unit.

A zoom lens comprising, in order from an object side to an image side:

• a first lens unit having positive refractive power and fixed for zooming;
• a second lens unit having negative refractive power and configured to move during zooming;
• at least two lens units configured to move during zooming;
• a final lens unit having positive refractive power, disposed closest to an image plane, and fixed for zooming;
• and
• an aperture stop disposed between a lens surface closest to the image plane of the second lens unit and a lens surface closest to an object of the final lens unit, configured to move during zooming, and located closer to the image plane at a telephoto end than at a wide-angle end,
• wherein the first lens unit includes a sub-lens unit disposed closest to the object in the first lens unit and fixed for focusing, and a sub-lens unit configured to move for focusing,
• wherein the second lens unit includes a first negative lens closest to the object in the second lens unit, at least one negative lens other than the first negative lens, and at least one positive lens,
• wherein the final lens unit is a fifth lens unit counted from the object side, and
• wherein the following inequalities are satisfied:
• 6
• ⁢
• 0
• ≤
• v
• ⁢
• d
• ⁢
• 2
• ⁢
• 1
• ≤
• 105
• 30
• ≤
• vd
• ⁢
• 2
• ⁢
• Nave
• ≤
• 65
• where νd21 is an Abbe number of a material of the first negative lens based on d-line, and νd2Nave is an average Abbe number of a material of the at least one negative lens other than the first negative lens in the second lens unit.

An image pickup apparatus comprising:

• a zoom lens;
• and
• an image sensor configured to capture an image formed through the zoom lens,
• wherein a zoom lens includes, in order from an object side to an image side:
• a first lens unit having positive refractive power and fixed for zooming;
• a second lens unit having negative refractive power and configured to move during zooming;
• at least two lens units configured to move during zooming;
• a final lens unit having positive refractive power, disposed closest to an image plane, and fixed for zooming;
• and
• an aperture stop disposed between a lens surface closest to the image plane of the second lens unit and a lens surface closest to an object of the final lens unit, configured to move during zooming, and located closer to the image plane at a telephoto end than at a wide-angle end,
• wherein the first lens unit includes a sub-lens unit disposed closest to the object in the first lens unit and fixed for focusing, and a sub-lens unit configured to move for focusing,
• wherein the second lens unit includes a first negative lens closest to the object in the second lens unit, at least one negative lens other than the first negative lens, and at least one positive lens, and
• wherein the following inequalities are satisfied:
• 6
• ⁢
• 0
• ≤
• v
• ⁢
• d
• ⁢
• 2
• ⁢
• 1
• ≤
• 105
• 30
• ≤
• vd
• ⁢
• 2
• ⁢
• Nave
• ≤
• 65
• 1.5
• ≤
• f
• ⁢
• 21
• /
• f
• ⁢
• 2
• ≤
• 5
• .
• 0
• where νd21 is an Abbe number of a material of the first negative lens based on d-line, νd2Nave is an average Abbe number of a material of the at least one negative lens other than the first negative lens in the second lens unit, and f21 is a focal length of the first negative lens, and f2 is a focal length of the second lens unit.