Galaxy NGC 7640 (type SBc, in Andromeda) shot Aug 31/Sept 01, 2006 with a DSI Pro II on a C8NGT (8"
Newtonian f5). This is a somewhat faint galaxy with a low surface brightness and is challenging from
a light polluted area with poor transparency. All subframes were 75 sec L:R:G:B ( in min)=
71:56:40:33. Captured with Envisage, calibrated and sigma combined in Iris with other processing
using PixInsight and Photoshop CS. North is up.