Zoom lens and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorYuki SHINZATO
Life of this patent
Estimating the term…
Abstract
A zoom lens includes, in order from an object side to an image side, a first lens unit with negative refractive power, a second lens unit, one or more intermediate lens units, and a rear lens unit. At least the second lens unit and the one or more intermediate lens units move during zooming. Each distance between adjacent lens units changes. The one or more intermediate lens units include an N-th intermediate lens unit disposed closest to an image plane, and the N-th intermediate lens unit includes a shift unit with positive refractive power disposed closest to the image plane and movable in a direction orthogonal to an optical axis of the zoom lens.
Claims23
A zoom lens comprising, in order from an object side to an image side:
- a first lens unit with negative refractive power;
- a second lens unit;
- one or more intermediate lens units;
- and
- a rear lens unit,
- wherein at least the second lens unit and the one or more intermediate lens units move during zooming and each distance between adjacent lens units changes,
- wherein the one or more intermediate lens units include an N-th intermediate lens unit disposed closest to an image plane, and the N-th intermediate lens unit includes a shift unit with positive refractive power disposed closest to the image plane and movable in a direction orthogonal to an optical axis of the zoom lens, and
- wherein the following inequalities are satisfied:
- 1.
- 8
- ≤
- fis
- /
- (
- -
- f
-
- 1
- )
- ≤
- 4.8
- 0.05
- ≤
- BFw
- /
- fw
- ≤
- 1.29
- where f1 is a focal length of the first lens unit, fis is a focal length of the shift unit, fw is a focal length of the zoom lens at a wide-angle end, and BFw is an air-equivalent distance on the optical axis from a lens surface closest to the image plane of the zoom lens at the wide-angle end to the image plane.
A zoom lens comprising, in order from an object side to an image side:
- a first lens unit with negative refractive power;
- a second lens unit;
- one or more intermediate lens units;
- and
- a rear lens unit,
- wherein at least the second lens unit and the one or more intermediate lens units move during zooming and each distance between adjacent lens units changes, and
- wherein the one or more intermediate lens units include an N-th intermediate lens unit disposed closest to an image plane, and the N-th intermediate lens unit includes a shift unit with positive refractive power disposed closest to the image plane and movable in a direction orthogonal to an optical axis of the zoom lens.
Dependencies are inferred from the claim text.