I had my ISO at 100 and it was still bright, so I strapped down the aperture. It was a day that I wish I had a fairly strong ND filter, but I did not. Also, for big landscape shots I typicaly shoot F16 or higher to get as much of the shot clearly captured as possible, especially when trying to keep foreground and background elements in focus. Being very close to the waterfalls in the foreground and wanting to get Kirkjufell and the wateralls in focus, F22 worked well. I took the shot at a few different F-stops and liked this shot the best out of the 3 or 4 that I took.