Does anyone know what the magnification value of the original F and F2 eyepieces are? Comparing the .7x D600 magnification to (say) my F2, the F2 has a larger magnification view, although I'm not sure what it is. It may be 1x for all I know. Aside from the split-image/microprism focusing aids, it's just so much easier to see and focus MF lenses on the F/F2 than the D600 (using two 50mm f/1.4s for comparison). I noticed that the D600, D800, D3, D4, etc. all list their viewfinders at .7x magnification. I'm at a loss as to what the point of this is. Over at the the DP-Review pages on the D600, I noticed the old Canon EOS-1DX had a significantly larger .76x viewfinder, although the newer MK IIs and MK IIIs have a .71x finder.
Looking around, I noticed Nikon listed the old DK-21M magnifying eyepiece as compatible with the D600: http://tinyurl.com/c4fo4f5
It's listed as having 1.17x power, which would bring the total magnification to .819x on the D600. Another option is to shoehorn a DK-17M magnifying eyepiece into a DK-22 eyepiece adapter for 1.2x magnification, bringing total magnification to .84x on the D600. Hopefully this would bring the D600's viewfinder near or at the old F/F2 finder magnification.
Frankly, I find this lower magnification annoying, I don't understand the point of it. The original F and F2 eyepiece views are so great compared to the modern Nikon bodies. I plan to replace the screen with a split-image/microprism focusing screen for my MF lenses, but overall viewfinder mag is bothersome. I went through this with the D5100, much worse of course, but helped at least by having a split-image/microprism screen. The situation is certainly better on the D600, but no match for the old Nikons. WTF?