Question
What is Chromatic Aberration? Is it a physical part of the lens, or just an optical illusion?
Answer
Chromatic Aberration is a distortion that occurs when a lens focuses different colours slightly differently.
It is caused by the refractive index of the lens (the amount that the lens bends light) being slightly different for different colours, so I suppose you could say it is caused by physical properties of the lens. It is possible to produce higher quality lenses that exhibit this effect to a lesser extent.
Wikipedia has a very detailed article on chromatic aberration.
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