I shoot lots of dawn/sunrise/sunset/dusk photos. Experimenting with my new D5100, it seems the Dusk/dawn scene works well when I'm in a hurry. When I look back at the resulting pictures, the WB varies between 4550K and 5000K, and seems to be a function of ISO. Of the pics I've taken, it looks like 5000K is used ISO200 and below, and 4550K above ISO200. Can anyone confirm this is what the camera is doing? Thanks.