-----Original Message-----
From: Ken Norton <kenorton@xxxxxxxxxx>
>>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
>
It would be quite a trick to actually "see" this on an OM-2S. If you can see
the meter, your head should be doing a pretty good job of blocking the
viewfinder. This usually presents a problem on autoexposure cameras that
don't have the OM-2S's OTF ambient autoexposure. That is why such models
usually come with a cap or have a built in shutter to close the viewfinder.
At least one manufacturer attaches one to the strap that comes with the
camera. A few cameras do have a manual TTL meter that can be read without
looking through the viewfinder, and this would be a problem with them. The
Nikon F is one example, and it did not come with a cap.
Doug
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