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Message: <blockquote data-quote="J-see" data-source="post: 434524" data-attributes="member: 31330">I've been shooting the Tam 150-600mm on the D810 and can't say it makes any difference to the D750 when it comes to shooting. If there is a difference in focus speed it is that small I don't notice it.I usually shoot the D750 at ISO 100 underexposed up to five stops and I can get good shots without a problem. I can't do the same with the D810 and even at 3 stops underexposed, it starts to show in the shots. The D750 does much, much better during low light. Certainly with my shooting style.The D810 wins when it comes to colors. It has close to a bit more color sensitivity and only after seeing the first shots, I fully realized what 1 bit implies. It's also sharper and makes the shots of my Tamron look like the lens is suddenly worth twice the price. When I up the ISO, the color sensitivity goes down and won't be that different of the D750 but the detail difference will remain.The RAW format also makes a lot of difference for birding. A 20% larger RAW is 20% more crop. It's as if I'm now shooting a 1.2x crop when compared to the D750. The file size difference however is not something beneficial. I use lossless compressed now which is some 36-40Mb each but when you get back home with 100-200 shots, that size difference starts to become a PITA.It slows everything down, requires more memory, takes more time in editors since they first need to un-compress them and then do every calculation on pretty massive files. Large formats are interesting, large file sizes not as much.Up to now both cams can be considered equals. Each of them specialized in something specific and thus better than the other at that but at all the rest; not too different. Both are worth the money.If Nikon added the best of both into a new FX, that would be something else.</blockquote>

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