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Message: <blockquote data-quote="J-see" data-source="post: 484266" data-attributes="member: 31330">Also keep in mind you're never going to have the same experience with the Tam on the D750 as you had on the D7100. Now 600mm looks like 600mm.I don't want to be a party pooper but if I was in the same situation, I'd get the Sigma C.Yes they say the Tam is a bit sharper at the long end but from what I see online, in practice I doubt it'll make any difference. Processing, light, aperture et all will each make more difference in sharpness between shots than the difference between the lenses.On all my cams the Tam freezes most on my D750. Now that might be because I mainly shot her on that cam during the low light season. You can gamble on getting a freeze-free specimen but I personally think the odds are low. If they would have fixed the issue, they could fix our issue but it's still deadly silent when it comes to that. You also have to keep in mind you'll need different fine tune values on different focal lengths which is impossible on a Nikon unless you want to do it manually each time. Unless you will do it manually each time you change length, the Sigma will, on average, take sharper shots (if you get the dock) because its tuning will be much more accurate.I'd consider this first if I was in your position.You know what they say about the donkey and the stone.</blockquote>