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Coma, in optics, it is a type of Aberration that affects both lenses and mirrors.
It causes a punctiform image, for example, a star that is at the edges of the visual field, to appear distorted as a comet-shaped figure, where precisely the definition of comma comes from.
Coma is an exaggerated form of spherical aberration that transforms images of non-axial points into series of tiny overlapping circles arranged similarly to that of a comet tail.
In large aperture telescopes, the comma is an aberration to take into account.
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