This was taken in the middle of the night, shortly after the rising of the full moon. I'm told the moonbow at Cumberland Falls is one of the few regularly occurring on earth. It appears the few days surrounding the full moon if all the other requirements of the weather and river are met. To the naked eye, it looks like an arch of white emanating from the falls. Alas, we're not able to see color without light, but with a camera and a long exposure, we can see the full spectrum present.
Camera Nerdery: I didn't have an off-camera shutter release, which would have made this much, much easier. Without one, I had to manually hold the shutter open for my exposures. Because of my hands-on handicap, I opted for shorter exposures at higher ISOs, knowing that the longer I had my hand on the camera during exposure, the more my little movements would add up to a fuzzy capture. [Canon 1Ds mkIII, Canon 15mm Fisheye, 77seconds, f/3.2, ISO 400]