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<blockquote data-quote="RocketCowboy" data-source="post: 604972" data-attributes="member: 25095">I'm late to the discussion as well, but just throwing my $0.02 worth in (before it's not worth any less).I've had an opportunity to shoot the Tamron 150-600 G1 on a few occasions. I now currently own the Nikon 200-500. From what I see of the G2 upgrades that Tamron is doing across it product lines, I suspect the 150-600 G2 will be even better than the original product, without question. That said, for me ... I think it's the fixed f/5.6 on the Nikon that really helps with the AF performance. More light gets in, so it's easier to track and focus. When I run a 1.4 TC on the 200-500, the AF performance is more like what I experienced with the 150-600. With the G2 lens still being an f/6.3 on the long end (they didn't improve the aperture across the zoom range, right?), I don't see it being any more snappy to auto-focus than the 200-500.With the right light, the extra reach of the 150-600 is great, but the performance trade off ... at least with the G1 ... was too much for me.</blockquote>

[QUOTE="RocketCowboy, post: 604972, member: 25095"] I'm late to the discussion as well, but just throwing my $0.02 worth in (before it's not worth any less). I've had an opportunity to shoot the Tamron 150-600 G1 on a few occasions. I now currently own the Nikon 200-500. From what I see of the G2 upgrades that Tamron is doing across it product lines, I suspect the 150-600 G2 will be even better than the original product, without question. That said, for me ... I think it's the fixed f/5.6 on the Nikon that really helps with the AF performance. More light gets in, so it's easier to track and focus. When I run a 1.4 TC on the 200-500, the AF performance is more like what I experienced with the 150-600. With the G2 lens still being an f/6.3 on the long end (they didn't improve the aperture across the zoom range, right?), I don't see it being any more snappy to auto-focus than the 200-500. With the right light, the extra reach of the 150-600 is great, but the performance trade off ... at least with the G1 ... was too much for me. [/QUOTE]

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