8 - 12 min. exposures combined then combined with image from 10-08-2008 for a total of 3.4 hours. Aligned and combined in RegiStar 1.07; Curves in Neb2. All other exposure attributes same - exposures at -10 deg. C. Gain 12%, Offset 100. TEC-140 (980mm, f/7) with the AP 27TVPH .75x reducer, yielding 760mm, f/5.4; Q285-M monochrome camera, Baader uv/ir filter.

20081220_Horsehead_1008-1220-Comb.tif