NGC 7009 (PN G037.7-34.5) also known as the "Saturn Nebula" shot Aug 13, 2006
with DSI Pro II on a C8NGT 8" Newtonian f5)operating at f7 (using a 1.4x
teleconverter). All subframes were 40 sec with the number of subframes
L:R:G::B = 37:20:20:20. Captured with Envisage, calibrated and sigma combined
in Iris with other processing using PixInsight and Photoshop CS.