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NGC 457 ET Cluster (105mm 5DII) with Spikes.jpg
NGC 457 open cluster in Cassiopeia. NGC 436 is at upper right and nebula Sharpless 2-188 at left. Taken Nov 4, 2010 with 105mm A&M apo refractor at f/5 with Borg .85x flattener/reducer and Canon 5DMkII at ISO 800 for stack of 4 x 10 minute exposures, Median combined. Used Celestron CGEM mount and Sky-Watcher SynGuider on William Optics 66mm guidescope. All seemed to work well.