[OM] Bright focusing screens?

[frankrad4]

   I would like to try a brighter screen than the one that came with my
OM-4.  I mostly have trouble when focusing on groups of people indoors. 
What screen should I try?  I know Olympus makes a 2-13 and 2-4 and then
there are Beattie screens which are more expensive.  Are the Beatties
much better?  Any thoughts about this would be appreciated.
                                                                         
                       Frank

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