calibration, camera—In photogrammetry, the determination of: (a) the calibrated focal length; (b) the location of the principal point with respect to fiducial marks; (c) the point of symmetry; (d) the resolution of the lens; (e) the degree of the flatness of the focal plane; and (f) the effective lens distortion in the focal plane of the camera, referred to the particular calibrated focal length.  In a multiple-lens camera, the calibration includes the determination of the angles between the component perspective units. The setting of the fiducial marks and the positioning of the lens are considered as “adjustments” although they are sometimes performed during the calibration process.  The distortion and other optical characteristics of a lens are determined in a focal plane, at the equivalent focal length; lens calibration.

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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