Thought you would have been across this forever Ken, it's always been on the
manufacturer's (Kodak & Fuji) datasheets for colour film (at least the ones
I've used).
...Wayne
>
> An acquaintance of mine helped "educate" me about Provia 100F color shift
> for dusk photography. It's just such a shame that I didn't learn about it
until
> well after transparency films went the way of land-line telephones.
Anyway,
> he had almost made a career of shooting there with Provia LONG after
> sunset. His observations were that it didn't get really good until about a
half-
> hour after sunset. I've personally been applying this trick to other
locations
> too and with fantastic results.
>
> However,
>
> Here is the rub. Films like Provia 100F have a reciprocity failure which
is not
> synchronized between the various color layers. In the case of 100F, there
is a
> marked shift towards magenta. But this shift towards magenta isn't an
overall
> color cast, but applies itself in a seemingly non-linear manner to the
different
> brightness levels.
--
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