>Other than the OTF metering during exposure, light through the viewfinder
>can get to nearly all normal SLR TTL meters. Without a one way mirror in the
>viewfinder, light can go from the viewfinder to the mirror just as easily as
>from the mirror to the viewfinder. It can then travel through the partial
>mirror down into the meter. The mirror seals the viewfinder during OTF
>exposure. I am surprised that the IS-3 doesn't have OTF flash metering, but
>John H. says no. For its intended usage, it really isn't needed.
But I don't see this problem with my OM-2S, even with an all-clear focusing
screen.
Ken Norton
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