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Message: <blockquote data-quote="Whiskeyman" data-source="post: 653700" data-attributes="member: 13556">Usually, teleconverters do somewhat degrade IQ.  One reason for this is that they are designed to work with many different lenses, not just one.  Theoretically, if designing a TC to work with just one lens, and thus integrally mounted, it could be better matched to the optical formula for that lens, and that should be a recipe for better IQ from the lens and TC combination.   This len's (a zoom) design would be much more challenging to optimize than a prime's, but is can be better than using a detachable TC made for a range of lenses.WM</blockquote>