Kind of off-topic, but I'd like to make just a small observation about overall flare caused by light scattering in-camera, e.g., from a lens with a large image circle and no lens hood.

This kind of flare tends to be overall fogging flare and will affect the low values, if the flare fog is great enough and the low values are low enough. In that situation, sure, some "crispness" (separation, contrast, however you like to describe it) will be lost in the very lowest values.

However, if the exposure is generous enough to get the low shadow values up "out of the fog," so to speak, the loss in contrast will be negligible, really negligible, in the final print, since the fb+f value, which prints jet black, now includes the flare fog.

In other words, to a great extent one can eliminate the effects of overall fog from stray light scattered by the bellows, etc. by simply overexposing a bit (something a lot of us have built into our exposure regimes already). Sure, using a lens hood is the best solution, but a bit of extra exposure in tricky or demanding situations can often save the day.

Furthermore, it's not always desirable to have the greatest separation possible in the toe area of the film. A lot of people use uncoated, flare-prone lenses just to get the slight overall fog and the softer shadows they produce. One could argue that using a lens with a little bit of flare allows more creative possibilities, since one can control to a great extent the effect of the fog on the lower values with exposure, just like one does with a film with a long curved toe (e.g., Tri-X 320).

Maybe all this worrying about 0.2% scattering is a bit superfluous...

Best

Doremus