[kevgermany]

Digital gets hit by noise in the shadows made worse by underexposure. Trick is to use the histogram and expose so that the right edge of the curve is at or fractionally below the right limit. Gives max shadows without blown highlights. Adjust to taste post exposure.

Incidentally if you're exposing slide film for scanning, then don't underexpose - this really only applies to projection - dark shadows come out very noisy on a home scanner. Trick here is to use a spot meter to assess the level of the highlights and set the exposure 1-2 stops over the meter reading for max dynamic range. Slides'll look thin, but they'll scan well and you can adjust later.