Optical testing apparatus for an optical system
AssigneedSam Ltd.
InventorDavid W. Samuelson
Life of this patent
Estimating the term…
Abstract
A testing apparatus for an optical system comprises a plurality of markers disposed along an axis to be aligned with the optical axis of the optical system, the markers being axially spaced from one another and angularly displaced relative to one another so as to effectively define a helix about the axis. When viewed from one end of the apparatus the markers provide focusing and depth of field information, and some aberrational information about the optical system. Preferably the markers are spaced so as to correspond to the depth of field of the lens aperture stop values of a camera, allowing the aperture settings of the camera to be tested.
Claims7
An optical testing apparatus for an optical system, the apparatus comprising a plurality of markers provided at or extending from an axis arranged to be aligned with an optical axis of the optical system, the markers being variably spaced from one another along the axis as a function of a focal length of the optical system in which the markers are further angularly displaced relative to one another about the axis.
An optical testing apparatus for an optical system, the apparatus comprising a plurality of markers provided at or extending from an axis arranged to be aligned with an optical axis of the optical system, the markers being variably spaced from one another along the axis as a function of a focal length of the optical system in which the markers are axially spaced to correspond with the depth of field calibration convention of a selected optical system.
An optical testing apparatus for an optical system, the apparatus comprising a plurality of markers provided at or extending from an axis arranged to be aligned with an optical axis of the optical system, the markers being variably spaced from one another along the axis as a function of a focal length of the optical system wherein one of the plurality of markers is selected as the focal center and further markers are located equidistant axially either side of the selected marker for testing symmetry of focus.
Dependencies are inferred from the claim text.