13 - 10 min. exposures for a total of 2 hours with the Q453HR/QHY8 color CCD camera at Gain 0, Offset 66. Telescope: TEC-140 (980mm, f/7) and no focal reducer, yielding 980mm, f/7; Astro-Tech 2" field flattener. Mount: Losmandy G11. Focused using a Bahtinov focus mask. No darks, nine bias frames and 3 flat frames applied. Post processing: bad pixel removal in Nebulosity2; Debayered, aligned, stacked and DDP in ImagesPlus 3.75 (Auto Image Set Processing). Curves in Nebulosity2. Final contrast, brightness and slight sharpening in ThumbsPlus. NeatImage noise reduction. Final contrast, brightness and slight sharpening in ThumbsPlus.


20091118_NGC891_Comb-ddpcrvadj_Neat.jpg