I mainly use a combination of f/11 or f/16, ISO 800 or ISO 1600, 1/125s or 1/60s. I never go beyond ISO1600 and really try not to go below 1/60s to avoid motion blur (even with the 15mm fisheye). With the very high DR of the D800 it is often possible to slightly underexpose the image and correct this in PP.
But since I'm always near the surface there is often enough light for a correctly exposed image at f/16, ISO800, 1/125s. When it's not sunny outside I avoid f/16 and mainly use f/11.