NGC7293, The Helix Nebula (Aqr)

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Technical data:    16"f/8-Hypergraph

                            STL6303E with Astronomik-Filterset IIc

                            HaLRGB (H-alpha=6x1200s, L=4x900s; R=3x450s; G=3x450s; B=3x900s)

                            Authors: Volker Wendel and Bernd Flach-Wilken

Technical data:    16"f/8-Hypergraph

                            ST10XME with Astronomik-Filterset

                            LRGB (L=3x1200s; R=3x480s; G=3x600s; B=3x900s)

                            Authors: Volker Wendel and Bernd Flach-Wilken

Technical data:      4"-Pentax SDUF II

                            ST10XME with Custum Scientific 3nm-H-alpha filter

                            2x30 minutes under extremly dark skies (LVM>7,5mag)

                            Hint: take a look at the very faint nebula structure in the lower right, itīs only 10 ADUīs above background

                            Authors: Volker Wendel and Bernd Flach-Wilken

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