wickerprints wrote:
I'd go a step further and actually suggest a split prism screen. Which gets me to thinking...I would love to see a split prism screen with five points--one in the center, and four in the 1/3 corners. One could adjust the size of the outer circle so that they all fit.
helimat wrote:
Uh, no. I have yet to see a split prism screen that is meant for lenses faster than f/2.8, and then you are locked into center composition or focus and recompose. For my cameras I use E*-S screens. They are fantastic for focusing fast lenses.
That's odd, because my experience with my old AE-1 with a split prism and a 50/1.8 shows that I can get much more accurate focus with the split prism than with a super-precision matte. Most film SLR bodies had split prism screens that permit focus at very fast apertures, certainly faster than f/2.8. If that weren't the case, people would have found it next to impossible to get sharp focus with fast primes on 35mm film.
As for the super-precision screens, I have one, and I still cannot achieve critical focus with it. You simply can't see the focus well enough at, say, f/1.2 or f/1.4; certainly not as well as Live View. As theSuede posted some time ago in another thread, the super-precision screens show more of the marginal rays faster than f/2.8, but actually not that much more.