- 160 is just 200 darkened
- on 7D you don't gain anything above 1600 => try 100/800 or 100/1600, but not more
- UniWB no longer makes sense, because you have raw zebras and histogram
I know ISO 160 is just 200 darkened, I used 160 because of the known vertical banding issue on 7D, while extreme recovering the shadows. It's weird, but you get less vertical banding on 160 rather than on 100 or 200, I don't know why, it just works for me.
I'll still try raw zebras and histogram, Dual ISO was my first ML test EVER : )