M57
Blue filtered total exposure time: 3 hours
Summer 2006
Red filtered total exposure time: 1.7 hours
Summer 2005
imaging setup:
location: California Central Coast Mountains (1,500 ft elev)
14.5" f/8 RCOS
Astro-Physics 900 mount
SBIG ST-10xe CCD camera with CFW-8
SBIG AO-7 (2005) AO-L (2006)
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