Fringe color filter – Achromatic refractor

Chromatic aberration of a convex lense
Image via Wikipedia

Fringe color filters are able to cut almost completely the secondary spectrum on images taken through telescopes that yield chromatic aberrations, like an achromatic refractor.  Here is an example of the difference between an picture of Jupiter taken through a fringe color filter (left) and a similar picture taken without that filter (right).

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