One thing I can never recall being discussed is the role of long OTF
exposure and reciprocity failure. Somehow, I suspect that the 1970s and
1980s electronics of the OM system do not compensate for reciprocity
failure and, even if they did, films vary considerably. From data on
the web, Provia 100F is remarkably immune to reciprocity failure out to
3 minutes and the error is probably negligible to double that or longer.
Presumably, this is why Ken chose Provia 100F.
For a less tolerant film how does one make a correct exposure? Take a
test shot, consult the reciprocity table for the test exposure and lie
to the camera via the ISO dial for the real exposure?
Chuck Norcutt
Carlos J. Santisteban wrote:
>
>
> But OTF does have some real advantages -- conventional metering could be
> fine 99.99 of the time, but sometimes there's no substitute. Not only the
> higher sensitivity (and with faster film, the OM-2n is _way_ better than the
> 4 on this respect) but a "slowly" changing situation like this is what makes
> OTF great!
>
> Film vs. digital is a different matter, of course... but it has been
> "proved" that there's no way to do OTF (or should we say OTS?) with a
> digital sensor, Oly or whatever.
>
> Cheers,
--
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