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US 2025/0231384 A1Published application
Zoom lens and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorShunji Iwamoto
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 having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a rear unit having a plurality of lens units, and distances change between adjacent lens units during zooming. A predetermined condition is satisfied.
Claims13
-13. (canceled)
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;
- a third lens unit having a positive refractive power;
- and
- a rear group having a plurality of lens units,
- wherein the rear group includes a lens unit LR closest to an image plane in the plurality of lens units,
- wherein each distance between adjacent lens units changes during zooming, and
- wherein the following inequalities are satisfied:
- 0
- .
- 2
-
- 7
-
- 8
- ≦
- f
-
- 1
- /
- ft
- ≦
- 0.346
- -
- 6.6
-
- 5
-
- 6
- ≦
- f
-
- 1
- /
- f
-
- 2
- ≦
- -
- 5
- .
- 6
-
- 0
-
- 4
- where f1 is a focal length of the first lens unit, ft is a focal length of the zoom lens at a telephoto end, and f2 is a focal length of the second lens unit.
44 more elements
Dependencies are inferred from the claim text.