There's a thread somewhere on the forum that has pages and pages of discussion and information pertaining to this. Perhaps someone can find it.
I really think you are making this way harder than you need...consider that you'll need to do extensive tests for filter factors and possibly development factors to equalize exposure and contrast. I don't really understand what you mean by "best b&w." Basically you can make a color image, and then use PS to selectively desaturate colors post exposure? Uh, just shoot color film...
Personally I have been experimenting with the technique on and off for different reasons:
Very interesting picture. Yes, I see the issues with the shadows and such. It isn't for every scene you may come across. In those situations, I might choose a filter or shoot all three as b/w and a luminence channel and pic the best of the three for post. Or just shoot a color frame and if I see it as b/w, then convert it post, using the channel mixer method, then either digitally print or print a digital negative the size I want and contact print it.
And yes light/shadow will be extremely problematic even at shorter exposures. Look on the bottom right of this image and you can see color artifacts from the shadows moving over the course of changing filters.
Bookmarks