Going with good glass filters if there was a way to make a rotating disk with the filters mounted in them you could change to the next filter pretty quick. Oversize glass would be handy. Would take some inventive engineering to get a practical mount for that.
Alternatively something like the cokin system that would allow the glass filters to be dropped in would be pretty fast change too.
For me personally, I don't own a DSLR or really any digital camera except my phone. I don't mind devoting a few B/W sheets and the chemicals to develop them, though. From everything I've seen I should be able to colorize and merge the negatives with software rather easily, assuming I expose them correctly in the first place.
Tin Can
Digi and film are quite different in this respect, with an appropriate film having much greater linearity. But it takes a LOT more than a few sheets of film to learn the ropes.
Trouble with that would be dust, anyway. Filters in the holder project any dust from the filter sharply onto the film. You already have 6 surfaces per image (3 sheets, front and back) to try and keep dust-free. Add a filter close to each piece of film and you increase that to 12 surfaces all combining their dust onto one photo. I would not want to spot that print.
If I were doing this, I would use a cokin type holder for square filters. Filter changes are quick and easy if you have everything ready. Expose in either ascending or descending order of filter factor so you’re not juggling settings around too much. You could get your three exposures as quick as a minute or minute and a half with regular holders and even less with a grafmatic and some practice.
-Chris
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