12 frames shot with Canon EOS 20D. Aligned, stacked and unsharp mask applied using Keith's Image Stacker. Converted to JPG in Photoshop. This one does not have levels applied, and I wasn't quite so aggressive with the Unsharp Mask as the other processed image.

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

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