M17 in H-Alpha Known as The Omega or Swan Nebula and also The Checkmark, Horseshoe and Lobster Nebula Captured from Fremont Michigan over 3 nights early October 2012 shot at native resolution (F5.5) Total Exposure time 5 hours. Location: Fremont, Michigan Date of Shoot 1st October 2012 All exposures unbinned H-Alpha 3nm 8 x 20 min QHY9M monochrome CCD cooled to -30C Thomas M. Back TMB 92SS F5.5 APO Refractor Paramount GT-1100S German Equatorial Mount (with MKS 4000) Image Aquisition Maxim DL Stacking and Calibrating: CCDStack Registration of images in Registar Post Processing Photoshop CS5 Clear Skies Terry