Secondary spectrum

The secondary spectrum is an aberration of an achromatic optical system. It causes color fringing on the edges of bright objects. It is a residual color defect or a chromatic aberration .

In principle, with an achromatic lens system, the color error can only be completely eliminated for two wavelengths. For all other wavelengths a color error remains. This can be further reduced by using an apochromatic lens system.

literature

• Eugene Hecht: optics . Oldenbourg, Munich 2005, ISBN 3-486-27359-0 , p. 443 .