Zoom lens and image pickup apparatus including the lens

A zoom lens comprising:

• a first lens unit having a positive refractive power;
• a second lens unit having a negative refractive power;
• a third lens unit having a positive refractive power;
• a fourth lens unit having a negative refractive power;
• and
• a fifth lens unit having a positive refractive power,
• wherein the first to fifth lens units are arranged in order from an object side toward an image side,
• wherein zooming is performed by moving some of the five lens units so that a distance between the first lens unit and the second lens unit is longer, a distance between the second lens unit and the third lens unit is shorter, and a distance between the fourth lens unit and the fifth lens unit is longer at a telephoto end than at a wide angle end,
• wherein the fourth lens unit is formed by one lens component, and is moved for image shifting in a direction having a component that is perpendicular to an optical axis,
• wherein the lens component includes a negative lens, and the following conditional expressions are satisfied:
• 63 <ν4, and
• D4/fw <0.3,
• where ν4 represents the Abbe number of the material of the negative lens, D4 represents the thickness of the fourth lens unit on the optical axis, and fw represents the focal length of the entire zoom lens at the wide angle end, and
• wherein the fourth lens unit includes an aspherical surface, and the following conditional expression is satisfied:
• 1×10−4<x/|f4|<1×10−2
• where x represents the maximum amount of displacement of the aspherical surface from a reference spherical surface, and f4 represents the focal length of the fourth lens unit.

A zoom lens comprising:

• a first lens unit having a positive refractive power;
• a second lens unit having a negative refractive power;
• a third lens unit having a positive refractive power;
• a fourth lens unit having a negative refractive power;
• and
• a fifth lens unit having a positive refractive power,
• wherein the first to fifth lens units are arranged in order from an object side toward an image side,
• wherein zooming is performed by moving some of the five lens units so that a distance between the first lens unit and the second lens unit is longer, a distance between the second lens unit and the third lens unit is shorter, and a distance between the fourth lens unit and the fifth lens unit is longer at a telephoto end than at a wide angle end,
• wherein the fourth lens unit is formed by one lens component, and is moved for image shifting in a direction having a component that is perpendicular to an optical axis,
• wherein the lens component includes a negative lens, and the following conditional expressions are satisfied:
• 63<ν4, and
• D4/fw<0.3,
• where ν4 represents the Abbe number of the material of the negative lens, D4 represents the thickness of the fourth lens unit on the optical axis, and fw represents the focal length of the entire zoom lens at the wide angle end, and
• wherein the following conditional expressions are satisfied:
• 3.0<f1/fw<6.0, and
• 0.9<|f2|fw<1.4,
• where f1 represents the focal length of the first lens unit, and f2 represents the focal length of the second lens unit.

A zoom lens comprising:

• a first lens unit having a positive refractive power;
• a second lens unit having a negative refractive power;
• a third lens unit having a positive refractive power;
• a fourth lens unit having a negative refractive power;
• and
• a fifth lens unit having a positive refractive power,
• wherein the first to fifth lens units are arranged in order from an object side toward an image side,
• wherein zooming is performed by moving some of the five lens units so that a distance between the first lens unit and the second lens unit is longer, a distance between the second lens unit and the third lens unit is shorter, and a distance between the fourth lens unit and the fifth lens unit is longer at a telephoto end than at a wide angle end,
• wherein the fourth lens unit is formed by one lens component, and is moved for image shifting in a direction having a component that is perpendicular to an optical axis,
• wherein the lens component includes a negative lens, and the following conditional expressions are satisfied:
• 63<ν4, and
• D4/fw<0.3,
• where ν4 represents the Abbe number of the material of the negative lens, D4 represents the thickness of the fourth lens unit on the optical axis, and fw represents the focal length of the entire zoom lens at the wide angle end, and
• wherein the following conditional expressions are satisfied:
• 1.5<f3/fw<2.5, and
• 1.5<f5/fw<3.0,
• where f3 represents the focal length of the third lens unit, and f5 represents the focal length of the fifth lens unit.

A zoom lens comprising:

• a first lens unit having a positive refractive power;
• a second lens unit having a negative refractive power;
• a third lens unit having a positive refractive power;
• a fourth lens unit having a negative refractive power;
• and
• a fifth lens unit having a positive refractive power,
• wherein the first to fifth lens units are arranged in order from an object side toward an image side,
• wherein zooming is performed by moving some of the five lens units so that a distance between the first lens unit and the second lens unit is longer, a distance between the second lens unit and the third lens unit is shorter, and a distance between the fourth lens unit and the fifth lens unit is longer at a telephoto end than at a wide angle end,
• wherein the fourth lens unit is formed by one lens component, and is moved for image shifting in a direction having a component that is perpendicular to an optical axis,
• wherein the lens component includes a negative lens, and the following conditional expressions are satisfied:
• 63<ν4, and
• D4/fw<0.3,
• where ν4 represents the Abbe number of the material of the negative lens, D4 represents the thickness of the fourth lens unit on the optical axis, and fw represents the focal length of the entire zoom lens at the wide angle end, and
• wherein a distance between the third lens unit and the fourth lens unit at the wide angle end is equal to that at the telephoto end.