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Message: <blockquote data-quote="J-see" data-source="post: 388077" data-attributes="member: 31330">I "improved" my TC20 and it does take a reasonable decent shot with my 70-300mm even at 300 (600) but loses AF at the long end. To get sharp shots, you need to close down to about f/11.That set-up limits the combo to tripod only. I needed too high shutter for it to do well birding and manual focus is pretty hard when it's double each time.I even tried it on my Tam and it takes a good shot there but because I need to add an extension ring between to make it work, I lose my infinity range.</blockquote>