NGC 6888

(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
Ha =180 minutes mapped to Red
OIII =120 minutes Mapped to Blue / Green
RGB Unbinned 90 minutes
CCDAutoPilot 4 for unattended imaging With MaxDL 4
Processed with CCDStack