That would be a loss of just less than 1/3 stop.
Moose
FaltusR@xxxxxxxxx wrote:
>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?
>>
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