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M 101 - faint backgroundM 101 - faint background

M 101

07./08./16./17./18.04.2010
Newtonian 250mm @f/4.8; Losmandy G11 mount
SBIG ST2000-XM CCD camera @-15°C
LRGB with L containing all L, R, G, B frames, R=R+Hα, L 43/ R 18/ G 13/ B 15/ Hα 9x600s (overall 16h20m), 200% drizzled
Rhein-Main area, Germany
North is on the upper side of the image

M 101

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