This photo was taken with my trusty Canon 60D and an 800mm Phoenix mirror lens. Exposure was 1/250, F8. The Phoenix lens is trickier to use because it's not image stabilized and it's a fully manual lens - it attaches with a ring adapter for the Canon body so you don't get any feedback through the camera for focusing or exposure. Only way to know for sure is to shoot the photos and check the results on the LCD screen. This is one of the better shots, which I then cropped to center on the moon itself.
Clear skies and comfortable temperatures helped minimize distortions and I'm pretty pleased with the results.