400mm with a doubler for 800mm and cutting the F stop in half makes full moon shots challenging. Some of the Aspen glow from the sun rising at the same time helps get the speed up. 6 seconds is about a long as one can make it. With new camera out by Canon and Nikon, moving up the ISO above 2000 can save the shots.
Using tools that predict Moonset angles for different times of year, I was able to line up with the California Minarets with the moon. My first attempt was too close to get a large moon. So I moved from 6 miles away to over 20 miles away the next time. Things were going great when the moon disappeared from clouds over the Eastern Sierras. At first I thought it would be a bust, but the moon peaked out a little and I was able to catch it. People tell me they like this shot over full moon shots.