Messier 101

(click image for full resolution)

By Ken Crawford using a 20" RCOS Carbon Truss Ritchey-Chrétien Telescope.

RCOS 20" Truss / Paramount ME
Apogee Alta 09000
AstroDon -Clr RGB Filters
Lum =120 minutes unbinned (Clr filter)
RB =90 minutes 1x1 each filter
Green = 60 minutes 1x1
CCDAP3 and MaxDl
Processed with CCDStack and PSCS2