NGC 281

(click image for largest version available)

By Ken Crawford at Rancho Del Sol Observatory using a 20" RCOS Carbon Truss Ritchey-Chrétien Telescope.

RCOS 20" Truss @ F8.6 / Paramount ME with 100mm FFC
Apogee Alta U9000
AstroDon - 50 mm Square Filters (2nd Generation)
Ha 6nm = 300 minutes unbinned Mapped to Green
SII 6nm = 480 minutes unbinned Mapped to Red
OIII 6nm = 420 minutes unbinned Mapped to Blue
CCDAutoPilot 4 for unattended imaging With MaxDL 4