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image 
Taken on September 21, 2005 from my backyard in Castro Valley, California
Astro-Physics AP180EDT f/9 imaging scope used at f/9 (F=1620mm)
Finger Lakes CM2-1 imaging camera operated at -20C
(to see biases/darks and flats for camera gain/readout noise measurements, click here)
Robofocus
Finger Lakes CFW7 Filter wheel
Astro-Physics 80/900mm guidescope
SBIG ST7E guide camera
Custom Scientific 3nm Ha filter (50mm unmounted)
four exposures of 20 minutes for Halpha
one hour and 20 minutes total exposure time