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Message: <blockquote data-quote="Woodyg3" data-source="post: 814840" data-attributes="member: 24569">Well, TCs are  better than they used to be. But it's a mixed bag. Take a look at Steve Perry's video:[MEDIA=youtube]7loeXXUP4Ic:479[/MEDIA]You pay a price for using a TC, but it looks like a 1.4X is at least usable on the 180-600.That said, I wouldn't do it, myself. It makes the lens an f/9 at 600 and as nice as the new 180-600 is, I wouldn't want to lose even a little sharpness with it at 600mm.I will note that I have NOT used the lens myself, just going based on what Steve has said, as I trust his advice.</blockquote>