Darrin, the 21mm Distagon is an amazing lens and I can thoroughly recommend it, but as DJ says it's very expensive now.
Well the focussing screen mystery continues.
I tried my 100-300mm f4.5-5.6 and 70-210mm f3.5 lenses today, and both seemed to focus accurately. It's driving me mad!!
Switched back to the 85/1.2 and 135/2 and it's off again.
I don't really feel inclined to spend any more time on it, because I just can't see there being a solution to such a ludicrous problem. I'll just have to put it with the Bermuda Triangle and Loch Ness Monster mysteries and forget it.
Thankfully I seem to be able to focus the standard screen accurately, so I think I'll stick with that and maybe email Katzeye and see when they're going to have their new screen ready...
Thanks to everyone for your help and suggestions anyway, much appreciated.
Cheers,
Matt
Well the focussing screen mystery continues.
I tried my 100-300mm f4.5-5.6 and 70-210mm f3.5 lenses today, and both seemed to focus accurately. It's driving me mad!!

Switched back to the 85/1.2 and 135/2 and it's off again.
I don't really feel inclined to spend any more time on it, because I just can't see there being a solution to such a ludicrous problem. I'll just have to put it with the Bermuda Triangle and Loch Ness Monster mysteries and forget it.
Thankfully I seem to be able to focus the standard screen accurately, so I think I'll stick with that and maybe email Katzeye and see when they're going to have their new screen ready...
Thanks to everyone for your help and suggestions anyway, much appreciated.
Cheers,
Matt