M13 Globular Star Cluster in Hercules.

Luminance: 11 x 300 seconds, DSI Pro III, Hutech IDAS LPS, Celestron C80ED at f/7.5
R, G, B: 9, 8 and 30 x 240 seconds, DSI Pro II, Meade RGB filters + IR block, Sigma APO Zoom lens at 330mm focal length, f/8

Simulatenous L (piggyback) and RGB (underslung with filter wheel). Dark-subtracted, flat-applied, upsampled, aligned, and average-stacked in ASIP. Color was registered onto luminance using PhotoShop. Levels and curves in PhotoShop.