Tokina AF 80-400mm f4.5-5.6 SD AT-X 840 AF II

The image below is an 100% crop from the center of a RAW Canon 40D frame (edged yellow, right).   Exact focus was obtained using Canon's excellent Live View feature at 10x.  The image was exposed for the craters at moon's lower edge.  This image has not been sharpened or been corrected for chromatic aberration.