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I used a Summicron 50/2 with no issues, Leitax mount, on a D600 and 800. David Llado at Leitax should be able to confirm which lens will work (with his mounts of course).
His mounts are great - highly recommended.
To answer your other questions - yes, stop-down metering, and no, I didn't feel the need to change the focussing screen (not sure you can anyway). The AF confirmation dot with his adapters is very accurate when the conditions are more difficult.
The IQ from my Summicron-R was the best of any lens I've ever used on the Nikon system....Show more →
Oh, didn't realize focus confirmation worked. I wish there was some way I could test the lenses before buying them, but that's not an option. Thanks for your feedback. I think I'll go for them.