20% or so of the light go thru mirror to sensor, rest comes
to viewfinder. I read it somewhere about OM-4.
Radek
==================================================
> I have a question w.r.t. reason (2). If the 2s mirror is half-silvered, does
> it not reduce the V.F. brightness by 1 stop, which would then be compensated
> for by the 2/3 stop brighter screen, leading to a net "no difference" in
> viewfinder brightness from the OM1/2?
>
>
> --
> Parzival Herzog
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