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12 - 12 min. exposures at -10 deg. C. Gain 12%, Offset 100. TEC-140 (980mm, f/7) with the AP 27TVPH .75x focal reducer, yielding 760mm, f/5.4; Q285-M monochrome camera, Orion 7nm Ha filter. 24 darks, 24 bias frames and 32 flat frames applied. Post processing in ImagesPlus using IP 3.75; curves in Nebulosity2.
20090115_Horsehead-Ha-Comb-DDP-adj.tif
All images copyright William J. Shaheen, unless otherwise noted. Do not use or distribute without prior consent.