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NGC 7789 (105mm 5DII).jpg
NGC 7789 open cluster in Cassiopeia. Taken Nov 2, 2010 with 105mm A&M apo refractor at f/5 with Borg .85x flattener/reducer and Canon 5DMkII at ISO 800 for stack of 5 x 10 minute exposures, Mean combined. Used Celestron CGEM mount and Celestron NexGuide on William Optics 66mm guidescope. All seemed to work well.