Originally posted by stevebrot The Canon eE-S screen is a good alternative that should not effect metering and as noted above, is available through focusingscreen.com. I have not used it personally, but would welcome a fine-focus alternative without the disturbing viewfinder clutter of the focus aids. On 35mm film, the split-image with microprism ring is fairly small and unobtrusive, but on APS-C, they are huge.
I actually bought a Type-S screen from focusingscreen.com and it is nice to use. I think I will be sending it back, however. Mine (with etched AF markings) does not meter properly with slower lenses under some circumstances. Would you believe 2 stops underexposed when used with the Pentax-DA 18-55/3.5-5.6 at 35mm?
Steve