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NGC7293, The Helix Nebula (Aqr)
Click here to get the h-alpha channel in full resolution, FWHM 2,0" 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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