Bob, I don't know if you want to consider this, but I'm sure a weak secondary exposure would pick up the shadows a little; essentially just like giving the film's sensi curve a longer toe. For what it's worth, this effect should also be identical to what a small amount of lens flare would do (maybe your lenses are too good).(posted 8780 days ago)I've never done it (intentionally), but on a sensitometric basis it's pretty straightforward (although not obvious) what happens, so I don't have any doubt about effectiveness. When you hear the zone system people talking about a zone1, etc, pre- or post-exposure, this is exactly what they're doing. On the sensi curve, the amount of secondary exposure controls how far up the response curve the toe will go. Too much will also raise the base + fog level substantially (but not highlight, etc, densities) so you're very limited in how far you can go.