M 17, The Swan Nebula (Sgr)

Technical data:    16"f/8-Hypergraph

                            STL6303 with Astronomic filter set IIc

                            HaRGB (Ha (12nm) = 4 x 900s; R and G = 3 x 300s; B = 3 x 600s)

                            Location: Namibia

                            Authors: Bernd Flach-Wilken and Volker Wendel

Comment: same data as above, here is the H-alpha channel displayed for itīs own.

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