Originally Posted by Max_Archer
Only problem, of course, is focusing accurately on a 1.4 tele through a modern DSLR finder. I shot a set with a friend's Zeiss 100, and he had a magnifying eyepiece that I was able to borrow since we both have D3 variants, and the eyepiece made all the difference in the world. I'm not sure if they're available for Canon or for square-eyepiece Nikons though. (Although the D800 has the same round eyepiece as the D3/4s, I think.)
I've gotten reasonably good at manually focusing using Live View and zooming in on the LCD - as long as the subject isn't moving too much.