Lenses and Geometrical Optics - Common Optical Defects
Coma - Similar to spherical aberration in many respects, coma is generally encountered with off-axis light rays and is most severe when the microscope is out of proper alignment. The aberration is named for its strong resemblance to the shape of a comet tail, and is manifested by a streak of light that appears to emanate from a focused spot at the periphery of the viewfield.
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