Rear conversion lens with vibration-reduction function
AssigneeNikon Corporation
InventorKenzaburo Suzuki
Life of this patent
Estimating the term…
Abstract
A rear conversion lens which has a negative refracting power and a function for magnifying, when mounted on an image side of an objective lens, an image formed by the objective lens, comprises, in the following order from an objective lens side, a first lens group having a positive refracting power and a second lens group having a negative refracting power. The lens groups are shifted as a whole in the direction perpendicular to the optical axis of the objective lens to stabilize the image magnified by the lens groups.
Claims15
A rear conversion lens having a negative refracting power and a function for magnifying, when mounted on an image side of an objective lens, an image formed by said objective lens, comprising, in the following order from an objective lens side, a first lens group having a positive refractive power and a second lens group having a negative refractive power, wherein said lens groups are shifted as a whole in a direction/perpendicular to an optical axis of said objective lens to stabilize said image magnified by said lens groups and said rear conversion lens satisfies:
- .vertline..DELTA.S/fR.vertline.<0.1
- 1.1<B<1.8,
- wherein
- fR:
- a focal length of said rear conversion lens
- .DELTA.S:
- a maximum shift amount of said lens groups shifted as a whole in the direction perpendicular to said optical axis of said objective lens for stabilization of said image
- B:
- a magnification of said rear conversion lens.
A rear conversion lens having a negative refracting power and a function for magnifying, when mounted on an image side of an objective lens, an image formed by said objective lens, comprising, in the following order from an objective lens side, a first lens group having a positive refracting power and a second lens group having a negative refracting power, wherein each lens group is moved in a direction perpendicular to an optical axis of said objective lens to stabilize said image magnified by each lens group and said rear conversion lens satisfies:
- .vertline..DELTA.S.sub.G /fR.vertline.<0.1
- 1.1<B<1.8,
- wherein
- fR:
- a focal length of said rear conversion lens
- .DELTA.S.sub.G :
- a maximum shift amount of each lens groups shifted in the direction perpendicular to said optical axis of said objective lens for stabilization of said image
- B:
- a magnification of said rear conversion lens.
A rear conversion lens having a negative refracting power and a function for magnifying, when mounted on an image side of an objective lens, an image formed by said objective lens, comprising lens groups, wherein each lens group is shifted in a direction perpendicular to an optical axis of said objective lens to stabilize said image magnified by each lens group and said rear conversion lens satisfies:
- .vertline..DELTA.S.sub.G /fR.vertline.<0.1
- 1.1<B<1.8,
- wherein
- fR:
- a focal length of said rear conversion lens
- .DELTA.S.sub.G :
- a maximum shift amount of each lens group shifted in the direction perpendicular to said optical axis of said objective lens for stabilization of said image
- B:
- a magnification of said rear conversion lens.
Dependencies are inferred from the claim text.