NGC 7789 Cluster with 5-inch apo refractor at f/4.5 with field flattener/compressor. With Canon 20Da camera at ISO400. Stack of three 8-minute exposures. Taken from home Nov. 20
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.
