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M57 Ring Nebula (5in f6 20Da).jpg
M57 Ring Nebula, taken Oct 6, 2007 with 5-inch Astro-Physics apo refractor at f/6 with Canon 20Da camera at ISO 400 for stack of 4 x 15 minute exposures. Guided with Meade DSI/66mm guisdescope and PHDGuide sofware. Some misguiding in Dec. No field flattener on 5in scope.