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p.1 #4 · p.1 #4 · 70D vs 6D noise/ISO difference and low light focusing | |
It greatly depends on your needs and the use you are planning for it.
Take into consideration that in terms of "reach", it does make a great difference.
I love FF, but if you need to shoot something small and distant... it becomes expensive, cumbersome and heavy.
So you get an idea, I have a 600mm f4IS and it feels short on FF. In fact it is "shorter" than a 400mm on a 70D or your 600D.
This should weigh heavily on your decision if you are planning on doing a lot of bird photography.
So you get an idea, the difference is bigger than the addition of a 1.4x tc (since the crop sensor is 1.6x). So a 70d (or your 600D) with a 100-400 (as an example) will have a narrower FOV (longer "reach") than the same lens on a 6D with a 1.4x TC.
If you wish to do a lot of low light stuff, FF is the way to go, for all the reasons you already know. IQ, low noise, DR, center AF.
If you plan on doing both, well, there is no perfect choice, unless you are rich.
You will need FF and long glass, which doesn't come cheap.
There is the tamron 150-600 route (awesome range for a great price) but I would wait for tamron to fix the AI-Servo issues.
Take into consideration that the 70D is supposedly slightly better than the 7D/600D (in terms of noise) in jpeg but hardly in raw. I say this because you own a 600D, so you are familiar with that sensor. So if you shoot raw, with a 70d you get the nearly the same noise levels as the 7D/600D, though it is more pleasing (less chroma, more grain like).
Good luck with your decision.
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