[OM] OM 2' series screens brighter, or Beattie's?

[Albert]

I'm wondering, which focusing screen series are brighter (and perhaps 
with better microprism)?
The  2 series from Olympus, or the Beatties?

Also, how much brighter over the 1 series are the 2 series?  1 F-stop? 
2-fstops?  What about the Beatties?
Albert


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