Zoom lens and apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorSatoshi Umehara
Life of this patent
Estimating the term…
Abstract
A zoom lens includes in order from an object side, a negative first lens unit and a rear lens unit including one or more lens units, an interval between adjacent lens units being changed during zooming, in which the first lens unit and the one or more lens units can be set to first, second and third zoom states, in which angles of view at first and second image heights at the first zoom state are respectively 160° or larger, in which a distortion at the first image height at the third zoom state is −30% or more, and the first image height, the second image height, a total length of the zoom lens at a wide angle end, and a focal length at the wide angle end are appropriately set.
Claims19
A zoom lens comprising in order from an object side to an image side, a first lens unit having a negative refractive power and a rear lens unit including one or more lens units, an interval between adjacent lens units being changed during zooming,
- wherein the first lens unit and the one or more lens units are set to a first zoom state, a second zoom state, and a third zoom state,
- wherein an angle of view at a first image height at the first zoom state is 160° or larger and an angle of view at a second image height at the second zoom state is 160° or larger,
- wherein a distortion at the first image height at the third zoom state is −30% or more, and
- wherein the following inequalities are satisfied,
- 1.5
- <
- H
-
-
- 1
-
- /
-
- H
-
-
- 2
- <
- 3.0
- ,
- and
- 5.0
- <
- Lw
-
- /
-
- Fw
- <
- 22.5
- where H1 represents the first image height, H2 represents the second image height, Lw represents a distance from a lens surface closest to an object to an image plane at a wide angle end, and fw represents a focal length at the wide angle end.
An apparatus comprising a zoom lens and an image pickup element configured to receive light of an image formed by the zoom lens,
- wherein the zoom lens comprises in order from an object side to an image side, a first lens unit having a negative refractive power and a rear lens unit including one or more lens units, an interval between adjacent lens units being changed during zooming,
- wherein the first lens unit and the one or more lens units can be set to a first zoom state, a second zoom state, and a third zoom state,
- wherein an angle of view at a first image height at the first zoom state is 160° or larger and an angle of view at a second image height at the second zoom state is 160° or larger,
- wherein a distortion at the first image height at the third zoom state is −30% or more, and
- wherein the following inequalities are satisfied,
- 1.5
- <
- H
-
-
- 1
-
- /
-
- H
-
-
- 2
- <
- 3.0
- ,
- and
- 5.0
- <
- Lw
-
- /
-
- Fw
- <
- 22.5
- where H1 represents the first image height, H2 represents the second image height, Lw represents a distance from a lens surface closest to an object to an image plane at a wide angle end, and fw represents a focal length at the wide angle end.
Dependencies are inferred from the claim text.