Hi ... I just purchased an adapter to use my manual focus Rokkor lenses on my Canon EOS 1V camera and am wondering about the option focus screens to aid in extremely shallow depth of field manual focusing. I have in my cart at KEH : EC-B MATT/MICROPRISM/SPLIT (1, N, NRS, 3, D2000), SCREEN This is the split prism matte screen for the 1 series bodies, right? Some questions: This will help me focus at say, f 1.2 or 1.4? Does this do anything to the autofocus system for when I plan to use my regular autofocus lens? I wouldn't have to change back to the other screen to use them, right? Will my red dots for focus/meter still be on there? I use the focus point as the metering point and would need them to still work (as opposed to using another metering option like matrix or something...). Thanks for ANY and ALL information!