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The Butterfly Cluster, M 6, NGC 6405, Collinder 341, Melotte 178 or OCL 1030 is a fine Open Cluster in Scorpius, it is some 20.00 arc minutes in size and shines at a magnitude of 4.60 on a fine background of Milky Way starfields.
Takahashi TSA-120 fitted with a Takahashi Reducer/Flattener operating at a focal length of 672mm or f/5.6.