ISO 1250, 1200mm/8 (i.e. 600mm wide open + 2x extender), ten 60-sec exposures, CGE mount unguided. 1:1 crop is inset for the pixel peepers, but note that the crop is probably more an expression of my imperfect tracking, seeing and stacking, rather than just the resolution of the lens. The individual frames have M13 too dim for examination before stacking.