At 03:32 PM 7/5/04, John Duggan asked in part:
>Do B+W filters work in the same manner on Chromogenic ? films?
In general effect, yes. In experimenting with XP2 and B&W Plus 400 a few
years ago, it was very similar to true B/W film, but not identical to
Plus-X, Tri-X or Scala, the B/W's I use most.
Exact effect a particular B/W filter has, as with *all* B/W films, depends
on the film's spectral response. This is depicted in the spectral response
curves in the data sheets . . . for B/W as well as color films. I've never
been able to visualize very well the exact effects to be expected on a
specific film using these curves, and have done much, much better shooting
a scene with a wide spectral representation using the various filters. If
I were more scientific about it, I'd shoot a color card under mid-day
direct daylight, measure densities, and compare them for the colors with
each filter . . . but I'm not . . . I'd rather get a "feel" for it
subjectively than generate yet another pile of numbers that don't relate
easily to what I can expect when *looking* at a scene I want to photograph.
Get a roll, grab the filters, find a landscape or architectural site with a
wide spectrum of colors and shoot it with each filter, then burn the
remainder making some snaps for the family album (perhaps using some
filters you might use with other B/W films).
-- John Lind
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