In article <330E7BBD.2304@netcom.ca>, atriange@netcom.ca says...

>Which focusing screen in F3HP and FM-2 is brighter?
>Thanks.

F3 screens came in two series - the later ones have a tiny red dot
on the frame, and are slightly brighter than the earlier ones.
F4 screens are a touch brighter yet, but may not be optimal if
you ever use the DA-2 Action Finder (a great device!). There are
non-GG G and H-series clear screens, but they are more trouble to
use, and add little, if any, brightness (surprisingly!). FM/FE/FA
screens came in two series - the later ones have a notch cut in
the small mounting tab, and are slightly brighter than the earlier
ones. Aftermarket bright screens trade contrast and illumination
uniformity for greater brightness - not a good trade for me, since
judging focus and subject illumination is more difficult with them.
Hope This Helps