Zoom lens and image pickup apparatus including the same

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

• a first lens unit having a positive refractive power;
• a second lens unit having a negative refractive power;
• and
• a rear unit having a positive refractive power as a whole, and consisting of, in order from the object side to the image side, 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 an interval between all adjacent lens units is changed during zooming,
• wherein the rear unit comprises a focus unit having a positive refractive power, which is configured to move during focusing, and an optical system being all lenses arranged on the image side of the focus unit having a negative refractive power at a telephoto end, the optical system not moving for focusing,
• wherein the first lens unit is configured to move toward the object side after moving toward the image side during zooming from a wide angle end to the telephoto end, and
• wherein the following conditional expression is satisfied:
• 2.0<|fpt/ft|,
• where ft represents a focal length of the zoom lens at the telephoto end, and fpt represents a combined focal length at the telephoto end of an optical system being all lenses arranged on the object side of the focus unit.

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

• a first lens unit having a positive refractive power;
• a second lens unit having a negative refractive power;
• and
• a rear unit comprising a plurality of lens units and having a positive refractive power as a whole,
• wherein an interval between all adjacent lens units is changed during zooming,
• wherein the rear unit comprises a focus unit having a positive refractive power, which is configured to move during focusing, and an optical system being all lenses arranged on the image side of the focus unit having a negative refractive power at a telephoto end, the optical system not moving for focusing,
• wherein the first lens unit is configured to move toward the object side after moving toward the image side during zooming from a wide angle end to the telephoto end, and
• wherein the following conditional expressions are satisfied:
• 2.0<|fpt/ft|, and
• 0.08≤dft/dt<0.20,
• where ft represents a focal length of the zoom lens at the telephoto end, fpt represents a combined focal length at the telephoto end of an optical system being all lenses arranged on the object side of the focus unit, dft represents an interval between the focus unit and a lens arranged adjacent to the focus unit on the object side at the telephoto end, and dt represents a distance from the most object side lens surface of the zoom lens to an image plane of the zoom lens at the telephoto end.

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

• a first lens unit having a positive refractive power;
• a second lens unit having a negative refractive power;
• and a rear unit having a positive refractive power as a whole and consisting of, in order from the object side to the image side, a third lens unit having a positive refractive power, a fourth lens unit having a positive refractive power, and a fifth lens unit having a negative refractive power,
• wherein an interval between all adjacent lens units is changed during zooming,
• wherein the rear unit comprises a focus unit having a positive refractive power, which is configured to move during focusing, and an optical system being all lenses arranged on the image side of the focus unit having a negative refractive power at a telephoto end, the optical system not moving for focusing,
• wherein the first lens unit is configured to move toward the object side after moving toward the image side during zooming from a wide angle end to the telephoto end, and
• wherein the following conditional expression is satisfied:
• 2.0<|fpt/ft|,
• where ft represents a focal length of the zoom lens at the telephoto end, and fpt represents a combined focal length at the telephoto end of an optical system being all lenses arranged on the object side of the focus unit.