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# might be
forums.steves-digicams.com/canon-lenses/127846-anyone-have-opteka-500mm-any-good.html

mind you, if you're alright with manual settings, amazon has a few good reviews
www.amazon.com/Opteka-Telephoto-Mirror-Olympus-Digital/dp/B000IMK9FG
(I helped save b3ta! McBadger COW, Fri 21 Aug 2009, 0:02, archived)