[stunsworth]

Frank, probably no help, but I fitted a Brightscreen to my 5D and found that the using the focussing screen gave me in focus shots. So if you're happy with the EF-S screen I'd stick to that since the AF confirmation isn't giving you the results you want.

I've no idea if some AF adaptors are better than others - I'd have though from an AF point of view they were all much or a muchness.