Aberration

Discussion

introduction

what is aberration

types/causes

chromatic aberration

Chromatic aberration comes in two types: axial and longitudinal.

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To reduce chromatic aberration, a higher quality optical device would use a special combination lens called an achromatic lens or achromat for short. The simplest such system consists of two lenses made of two different glasses: a converging lens made of crown glass (the very common kind of glass used in windows) and a diverging lens made of flint glass (the slightly fancier kind of glass used in chandeliers and crystal decanters).

An apochromatic lens corrects for both chromatic and spherical aberration.

chromatic aberration in the eye

The apparent three dimensional appearance of this album cover is an optical illusion caused by chromatic aberration in the eye.

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spherical aberration

spherical

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geometric aberrations

coma

distortion

astigmatism

field curvature