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Message: <blockquote data-quote="Eyelight" data-source="post: 369799" data-attributes="member: 24753">What Mr. Fish said.It's how the light makes it thru the lens and  different colors that make up the same point on the subject not always  getting focused on the same point in the image.  Sometimes worse with  digital sensors.  Sometimes easy to fix and other times not.I am  guessing it is different on different edges because light reflects as  different colors off of different angles of the same object and the  wavelength of light is different with different colors.There is a  lot of reading out there on the causes and what can be done.  Lenses  are designed to reduce it and some more so than others.</blockquote>