Also: shoot RAW. The more information you have, the less banding may occur, or at least you may be able to mitigate or offset it more in development.
I learned the hard way with the DP2M that shooting jpgs only (which I was persuaded to do by advocates here, and which made development in Lightroom easier) resulted in banding even at iso100 in certain conditions. One example, a coastal Pacific landscape late afternoon shot from a bluff 200 feet up, gave great detail for the beach and sea stacks, but the relatively clear sky banded though it was exposed well. The other that comes to mind was a high perspective of the Willamette River and East Portland blanketed in fog with buildings emerging, and Mount Hood faintly in the distance. I exposed for the fog and sky; the banding shows in the less exposed riverside buildings/cityscape. What I took from this, besides the mistaken relying on jpg resolution, is that the sensor didn’t like large areas with very different light values.
I rarely experience this when I let the Foveon sensor collect all the RAW. I no longer have a Dp1s, but I keep a DP3M, a DP2Q, and an SDQ with 3 lenses. Fabulous tools. I just wish I could have that first year or so with the DP2M back for RAW do-overs.
