aberration : Spreety TV Online Glossary
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aberration n. 1. Commonly: an optical defect
in a lens or mirror that causes it to form an image that is distorted. 2.
Technically: the convergence of rays of light emanating from a single point to
different focal points by a lens or mirror (which, without the aberration,
would focus at a single point), or the deviation of such rays from a single
focus.
• Spherical
Aberration: The spherical shape of a lens (thicker in the center than at
the edges) causes rays of light passing through the edge of the lens to have a
different focal point from the rays that pass through the center. This is most
apparent when using a fisheye lens.
• Chromatic
Aberration: Each color of light is bent by a slightly different amount when
passing through a lens, giving each color a distinct focus due to different
refrangibilities of the colored rays of the spectrum. This is most apparent
when light passes through a prism.
Compare astigmatism; barrel distortion; comatic
aberration; curvature of field; curvilinear distortion; flare; ghosting; keystone;
lateral chromatic aberration; longitudinal chromatic aberration; pincushion
distortion; transverse chromatic aberration; veiling glare.
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