NGC 7635 Bright emission and reflection nebula in Cassiopeia also known as the Bubble Nebula. Taken
Nov 08, 2006 with a DSI Pro II on a C80ED operating at f7.5. RGB subframes were 75 sec, while the
H-alpha subframes were 150 sec for a total exposure in Ha+R:G:B (in min) = 50+44:26:43. For
Luminosity processing some of the Ha was mixed with the RGB channels and then assembled for the final
result. Captured with Envisage, calibrated and sigma combined in Iris with other processing using PixInsight
LE and Photoshop CS. North is up.