I didn't find the filter factors to have that kind of disparity, but if you go for a more extreme red (29) filter you might hit a higher filter factor (recommended at 4 1/3 for standard photography, but I found the standard recommendation of 3 stops too much for an R25 filter when used for tri-color, so YMMV).
Wonderful. Thanks, Corran! So blue's the slowest. I wouldn't have guessed that!
Vance: very nicely done!
Perhaps grafmatics would help you get the needed exposures in somewhat shorter time with less manipulation of the camera. They even hold sheets in a multiple of three.
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-Chris
I've looked at them for the general convenience of shooting faster, and I don't think I'll go that route. First off, they're very expensive (for my budget) on the used market in good shape, and second, I think they would lead to me shooting 4x5 too quickly and not treating it like it is, a very limited resource for me.
As for this application, I don't know that it would speed up the operation that much, since the real time-consuming thing is not dealing with the film holders, but changing the filters without moving the camera. Lord knows if I were a rich man I would just have a grafmatic, a separate identical lensboard and lens already cocked and set for each of the three exposures, and real TMAX 100 to shoot in it.
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