12 frames shot with Canon EOS 20D. Aligned, stacked, unsharp mask and levels applied using Keith's Image Stacker. Converted to JPG in Photoshop. This images is starting to look overprocessed.

Canon 100-400mm f/4.5-5.6 lens at 380mm

See the nearby unprocessed "Gibbous Moon - unprocessed frame" image as a comparison.