The Swan Nebula (M17) in Hydrogen-alpha (16 x 5 minute exposures...

The Swan Nebula (M17) in Hydrogen-alpha (16 x 5 minute exposures with the WilliamOptics ZS61 and Atik414EX mono CCD camera). Reprocessing a set of frames I shot almost a year ago. https://SaltwaterWitch.com