What is Chromatic Aberration? (Purple Fringing)
DefinitionColor fringing along high-contrast edges.
1The Simple Explanation
Glass acts like a prism. Sometimes, a lens fails to bring all the colors of the rainbow to the exact same focus point. Purple or green spills out the sides.
2Technical Deep Dive
Longitudinal CA (purple/green in out of focus areas) and Lateral CA (color shift at corners). Cheap lenses suffer most. Easily corrected in Lightroom software.
Common Misconceptions
Myth: It means my sensor is broken. Fact: It is purely an optical (lens) flaw, not a sensor issue.