Abstract: A focal reducer for use with a camera and a primary lens moves the image formed by the primary lens farther back within the lens/reducer/camera assembly so that the image of an object within the field of view is formed at the image plane of the camera. Relaying the image from the image plane of the primary lens to the image plane of the camera enables the primary lens and the camera, which have the same type of mount, to be used with a focal reducer. Previously, a primary lens and a camera having the same type of mount could not be used with a focal reducer, because the focal reducer interposed between the primary lens and the camera caused the image plane of the primary lens to be located in front of the image plane of the camera, making it impossible for the lens/reducer/camera assembly to achieve infinity focus.

Abstract: Lens assemblies according to the disclosure include an anamorphic lens component and a primary lens component. The anamorphic lens component includes cylindrical lens elements and one or more spherical lens elements disposed between the cylindrical lens elements and translatable along an optical axis of the anamorphic lens assembly with respect to the cylindrical lens elements. Optical characteristics of the anamorphic lens component are adjustable as the one or more spherical lens elements translate along the optical axis such that the cylindrical lens elements and the one or more spherical lens elements in combination produce a first astigmatism that is opposite to a second astigmatism produced by unequal movement of an image plane along horizontal and vertical axes as an object moves from infinity focus toward the lens assembly.

Abstract: Lens assemblies according to the disclosure include an anamorphic lens component and a primary lens component. The anamorphic lens component includes cylindrical lens elements and one or more spherical lens elements disposed between the cylindrical lens elements and translatable along an optical axis of the anamorphic lens assembly with respect to the cylindrical lens elements. Optical characteristics of the anamorphic lens component are adjustable as the one or more spherical lens elements translate along the optical axis such that the cylindrical lens elements and the one or more spherical lens elements in combination produce a first astigmatism that is opposite to a second astigmatism produced by unequal movement of an image plane along horizontal and vertical axes as an object moves from infinity focus toward the lens assembly.

Abstract: A focal reducer for use with a camera and a primary lens moves the image formed by the primary lens farther back within the lens/reducer/camera assembly so that the image of an object within the field of view is formed at the image plane of the camera. Relaying the image from the image plane of the primary lens to the image plane of the camera enables the primary lens and the camera, which have the same type of mount, to be used with a focal reducer. Previously, a primary lens and a camera having the same type of mount could not be used with a focal reducer, because the focal reducer interposed between the primary lens and the camera caused the image plane of the primary lens to be located in front of the image plane of the camera, making it impossible for the lens/reducer/camera assembly to achieve infinity focus.

Abstract: Lens assemblies according to the disclosure include an anamorphic lens component and a primary lens component. The anamorphic lens component includes a first cylindrical lens element, a second cylindrical lens element, and a first spherical lens element disposed between the first and second cylindrical lens elements and translatable along an optical axis of the anamorphic lens assembly with respect to the first and second cylindrical lens elements. Optical characteristics of the anamorphic lens component are adjustable as the first spherical lens element translates along the optical axis such that the first cylindrical lens element, the first spherical lens element, and the second cylindrical lens element in combination produce a first astigmatism that is opposite to a second astigmatism produced in an image plane by the primary lens component as an object moves from infinity focus toward the lens assembly.

Abstract: Lens assemblies according to the disclosure include an anamorphic lens component and a primary lens component. The anamorphic lens component includes cylindrical lens elements and one or more spherical lens elements disposed between the cylindrical lens elements and translatable along an optical axis of the anamorphic lens assembly with respect to the cylindrical lens elements. Optical characteristics of the anamorphic lens component are adjustable as the one or more spherical lens elements translate along the optical axis such that the cylindrical lens elements and the one or more spherical lens elements in combination produce a first astigmatism that is opposite to a second astigmatism produced by unequal movement of an image plane along horizontal and vertical axes as an object moves from infinity focus toward the lens assembly.

Abstract: Lens assemblies according to the disclosure include an anamorphic lens component and a primary lens component. The anamorphic lens component includes a first cylindrical lens element, a second cylindrical lens element, and a first spherical lens element disposed between the first and second cylindrical lens elements and translatable along an optical axis of the anamorphic lens assembly with respect to the first and second cylindrical lens elements. Optical characteristics of the anamorphic lens component are adjustable as the first spherical lens element translates along the optical axis such that the first cylindrical lens element, the first spherical lens element, and the second cylindrical lens element in combination produce a first astigmatism that is opposite to a second astigmatism produced in an image plane by the primary lens component as an object moves from infinity focus toward the lens assembly.