Definition of coma

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PFG Precision Optics - Precision Optics 12/24 LB

Photonics Dictionary

coma

A lens aberration, resulting from different magnifications in the various lens zones, that occurs in that part of the image field that is some distance from the principal axis of the system. Extra-axial object points appear as short cometlike images with the brighter small head toward the center of the field (positive coma) or away from the center (negative coma).

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