This is the RGB + 9 hours of H-Alpha. Total Exposure 12 hours. Thanks for looking All the Best & Clear Skies Terry Location: DownUnder Observatory, Fremont MI Date of Shoot June 5th, 6th, 7th and 8th, 13th June 2012 Exposure: Hydrogen Alpha 3nm 9 x 40 min unbinned, RGB 6 x 10 min each unbinned Camera: QHY9M monochrome CCD, cooled to -30C www.astrofactors.com StarlightXpress Color Filter Wheel Scope: Astronomy Technologies Astro-Tech 10" f/8 Ritchey-Chrétien astrograph Astro Tech 2" Field Flattener. Autoguided using QHY5 autoguider, StarlightXpress Ultra Slim Off Axis guider Paramount GT-1100S German Equatorial Mount (with MKS 4000) Image Aquisition software Maxim DL5 Stacking software CCDStack Post Processed with Photoshop CS5 At a distance of about 1,360 light years from Earth, The Dumbell Nebula is also known as Apple Core Nebula and NGC 6853, this planetary nebula lies in the constellation Vulpecula.