Lunar Rainbow Photo

Hi
I took this in October 2010 - after dark just north of Kenmare in Co Kerry. The rainbow just appeared as a white arc to my eye- and I wasn't quite sure what it was until I noticed the moon was full in the opposite direction.
I'd never heard of this phenomena before (even though it makes perfect sense)- anyway I rushed inside to get the camera and here is the outcome. I didn't have time to get the tripod and it was a 6 second exposure, but I think I did well enough as there isn't a great deal of shake.

I shot it in RAW format so I was able to increase the exposure by 15 stops afterwards in pshop- and this is the outcome. It's noisy as hell - but I kind of like it.