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Message: <blockquote data-quote="Krs_2007" data-source="post: 388013" data-attributes="member: 12948">Can't speak to all lenses, but my nikon 2x and 70-200 2.8 auto focus.  I am thinking about getting the 1.7 as well, the 2x does seem soft on the long side and the 1.7 seems to get better ratings.  Plus if I get the 300 f4, the 2x makes it a f8 lens but the 1.7 keeps it at 5.6.  Just another thing to think about with TC's is they factor on your aperture.it would be better to just the 300 f2.8, but I just can't throw down that kind of cash right now.also go to nikons site, look at the TC's, they have a compatibility chart.</blockquote>