In article <4ml3sj$rtj@yar.trincoll.edu>, dave.ahlgren@mail.trincoll.edu says...

>The split image screen on my FM2 blacks out when I use my long lenses. >I would like to replace it by one with a central focusing prism or just
>a plain ground glass sceen. Anybody have experience with such a
>replacement?

The Nikon "B" and "E" (same matte screen, but with a grid) work fine,
and get rid of those pesky "focusing aids" that clutter up the middle
of the VF screen where GG focusing is best (and easiest).
Hope This Helps