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Message: <blockquote data-quote="T-Man" data-source="post: 447179" data-attributes="member: 22038"><p>Totally understand the concern, except if you were looking to expand the reach of the 300, I don't believe the TC1.4 will handicap your lens performance anywhere close to the degree the TC2.0 does, so I think you'd still find the 300+TC1.4 an advantageous combo versus the Tam @ 420, in a lighter, shorter package. If you're looking for quality first, reach second, the TC1.4 won't cause much noticeable reduction in IQ and won't slow down focusing, while at the same time giving you at least the same or slightly larger max aperture vs. the Tam at the same FL. And, you can find them on eBay for $250 or so. With the TC2.0 you're at a 1-stop disadvantage to the Tam @ 600 wide open, with focusing handicaps thrown into the mix.</p></blockquote><p></p>