The cds cells are not adding to the exposure. As good as otf exposure is,
in this case, when you're trying to do a "no light" test, the light
entering through the eyepiece is so drastic compared to light near the film,
that light leakes around the mirror and affects exposure.
If you're shooting at night outside, it would be the same effect as starting
a long time exposure and pointing a lit flashlight into the eyepiece.
John Hermanson
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----- Original Message -----
From: Jan Steinman <Jan@xxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, May 01, 2000 7:29 PM
Subject: Re: [OM] 2n long exposure
> >If you're testing yours, make sure body cap is
> >on AND cover the eyepiece lens with black tape.
> >"But eyepiece light doesn't affect exposure....." in this case it will.
>
> That's kind of scary, since the exposure is supposed to come from the
> SBCs in the mirror box, NOT the selenium cell that points at the
> focusing screen. This was a big point in Olympus' ads of the day,
> since competing cameras required an eyepiece cover for long exposures.
>
> Does this mean light leaks into the mirror box from the eyepiece, or
> that the secondary metering system somehow affects exposure, or, or,
> or?
>
> : Jan Steinman <mailto:Jan@xxxxxxxxxxxxxx>
> : Bytesmiths <http://www.bytesmiths.com>
>
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