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| p.1 #4 · Are you focusing manually with a D600 or D800 ?? |
Both Canons and Nikons tend to have focusing screen optimised for viewing combined with AF, not for MF. The stock screen for Nikon is a bit darker and a bit better for manually focusing, in my experience. However, the Eg-S and similar screens are even darker, and even better for manual focus. There is no version of these screens for the 5DIII, however.
I am not aware of any screens which fit the D800 yet, and the D600 is probably too new. The screen in the D800 comes out as easily as the old ones, i.e. there is just a little lever to open with your fingernail. Some users adapted the Canon Ee-S or Eg-S for the D700, but I don't know if it will fit in the D800, which has a bigger viewfinder.
The IQ of the current batch of Nikons is better than that of the Canons, but colours are a matter of preference. The D700/D3 had in general decent colours, but not as nice skin tones as the 5DII. I don't know the 5DIII. The D800 is more accurate and has better skin tones than the D700/D3, and it has the largest dynamic range of any current DSLR. The D800 high ISO performance is as good as the D700/D3, if you are willing to downsize the images to 12MP.
The D800 can be very hard to focus, especially in bad light, but the focus assist lights are quite good, and live view works well. AF is very good, but not as fast as the 5DIII.
As you can see, the list of factors to consider just goes on and on. Any of these cameras will deliver great images if you pay attention. You should think about which factors are most important to you.