Optical aberration

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Piston
Tilt
Defocus
Spherical aberration 3.png Spherical aberration
Lens coma.png Coma
Astigmatism.svg Astigmatism
Field curvature.svg Petzval field curvature
Lens6a.svg Chromatic aberration

Aberrations are departures of the performance of an optical system from the predictions of paraxial optics.[1] Aberration leads to blurring of the image produced by an image-forming optical system. It occurs when light from one point of an object after transmission through the system does not converge into (or does not diverge from) a single point. Instrument-makers need to correct optical systems to compensate for aberration. The articles on reflection, refraction and caustics discuss the general features of reflected and refracted rays.

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