Optical aberrations: how to fix errors in your telescope | BBC Sky at Night Magazine
Features & Documentation: Filter: Feature Manipulation by Colour
blue halos around stars - Beginning Deep Sky Imaging - Cloudy Nights
La Pine Observatory: Getting Rid of Some Chromatic Aberration In Astrophotography
How to get rid of unwanted colour fringes on stars in astrophotos | BBC Sky at Night Magazine
This is the region around Cygnus of the Milky Way, is the colour right? And how do I get rid of the chromatic abberation around some of the stars : r/AskAstrophotography
History: The Spherical Aberration Problem | ESA/Hubble | ESA/Hubble