[Thanks, ebsmooth. This is really a practical question! I tend to like long exposures (at a small f/stop) for film. Just wondering what is the best strategy for digital. Lengthing the exposure time, or increasing the ISO???] ...hmm ISO 200 @ 1/15th != ISO 100 @ 8 sec How 'bout (at the same aperature): d) 1/2 second @ ISO 800 b) 4 Sec @ ISO 100 ??