Comma (optical)

Comma (optical)

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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