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.
Messier and NGC clusters in eastern Cassiopeia, taken Sept. 14, 2007 for stack of 4 x 4 minute exposures with 135mm L-series lens at f/2.8 and Canon 20Da camera at ISO 800. Simulates binocular field. Includes M103, NGC 663, NGC 654; NGC 659; NGC 457. Faint spot at upper left is cluster IC 166.
The large open cluster NGC 752 in Andromeda, taken Sept. 14, 2007 for stack of 4 x 3 minute exposures with 135mm L-series lens at f/2.8 and Canon 20Da camera at ISO 800. Simulates binocular field.
