Kodak used to publish reciprocity data.My 1980 copy of "E-77 Kodak Color
Films" is hopelessly out of date now.Only the Kodachrome 25 and 64 data
might be useful these days."F-5 Kodak Professional Black and White
Films" from 1990 has 2 charts on pg.31 that show the T-Max films have
the least amount of speed loss at long exposure times.
My 1994 copy of Professional Fujichrome/Fujicolor/Neopan Dataguide has
some reciprocity law failure data starting on pg.29.The problem is that
new emulsions keep coming out all the time and the info you want is not
packaged with the film.
-Gene Mayeda
John Petrush wrote:
>
> Kodak's PPF-400 film displays favorable reciprocity characteristics. It is
> about a full stop after two minutes - two stops after 5 or 6. At least its
> fairly predictable. It is my standard astrophotography film.
>
> One of the folks on the Astrophotographers mailing list is completing a test
> of 37 different films, measuring reciprocity failure as a key metric. The
> other main factor is sensitivity at different wavelengths. Its not an
> exacting scientific study, but his method seems valid. If the group is
> interested I'll cross-post his findings here.
>
> John P
>
> <snipitty - snip....>
> >As someone pointed out, there is
> >reciprocity failure that changes both time and color with long exposure.
> >This varies greatly between films, and color shift can usually be dealt
> with
> >in printing negative film. The easiest solution is to use a print film with
> >little reciprocity failure. As Shipman points out in his books, many
> other
> >factors come into play that can offset reciprocity failure. I have shot
> many
> >pictures at night using Fuji Super G Plus 400 that are virtually
> >indistinguishable from daytime shots. I wonder how the new Kodak Gold Max
> >works. It does have the latitude, but I don't know about reciprocity
> >failure. I have been unsuccessful in finding reciprocity failure data for
> >many films.
> >
> >Doug
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