Anamorphic converter, lens system, and shooting system
AssigneeCanon Kabushiki Kaisha
InventorRyuji Nurishi
Life of this patent
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Abstract
An anamorphic converter, which is disposed at an image side of an image-forming optical system, includes a first lens unit having one of positive and negative optical power, a second lens unit including an anamorphic lens, and a third lens unit having positive optical power, positioned in order from an object side to the image side. The second lens unit is removable from the position between the first lens unit and the third lens unit.
Claims16
An anamorphic converter disposed at an image side of an image-forming optical system, comprising:
- first, second and third lens units positioned in order from an object side to the image side;
- the first lens unit having one of positive optical power and negative optical power;
- the second lens unit including an anamorphic lens;
- and
- the third lens unit having positive optical power,
- wherein the second lens unit has a first state in which the second lens unit is positioned between the first and third lens units, and a second state in which the second lens unit is removed from the position between the first lens unit and the third lens unit;
- wherein, in the second state of the second lens unit, the first lens unit and the third lens unit cooperate as a magnification-converting optical system.
An anamorphic converter disposed at an image side of an image-forming optical system, comprising:
- first, second and third lens units positioned in order from an object side to the image side;
- the first lens unit having one of positive optical power and negative optical power;
- the second lens unit including an anamorphic lens;
- and
- the third lens unit having positive optical power,
- wherein the second lens unit has a first state in which the second lens unit is positioned between the first and third lens units, and a second state in which the second lens unit is removed from the position between the list lens unit and the third lens unit,
- wherein the first lens unit has negative optical power, and
- wherein the first lens unit includes a positive lens element and a plurality of negative lens elements, and wherein an average Abbe number of the positive lens element (νp1) and an average Abbe number of the negative lens elements (νn1) satisfy the following expression:
- νn1−νp1>10.
Dependencies are inferred from the claim text.