Quote Originally Posted by Katie View Post
I put in the EEs (I think) which helps trmendously with manually focusing my fast glass. It just the super sensitive microprism one... Took me a few seconds to do, but a few days to work up the nerve!
Yep, I put one on my 5D (opps did I just cop to having a 5D )
I think its an "S"

I believe the standard af screens are optimized for lenses with max aperture of 2.8