Last night I did some astrophotography at the River Ridge Observatory before the Moon came up. This is the Cocoon Nebula aka IC5146 in Cygnus. This was shot with an IDAS NBZ UHS dual narrowband filter that lets Hydrogen Alpha and Oxygen III light through and little else. The former is red, the latter green. The blue channel was almost nonexistent. This was almost two hours of five minute shots with my 11″ SCT at f/6.3 and ZWO ASO 294MC Pro.
