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13 - 12 min. exposures for a total of 2.6 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. Post processing: bad pixel removal in Nebulosity2 using 5 dark frames (threshold 238); nine bias frames and 3 flat frames applied, debayered, aligned, stacked and DDP in ImagesPlus 3.75 (Auto Image Set Processing). Curves and color adjustment in Nebulosity2. NeatImage noise reduction. Final contrast, brightness and slight sharpening in ThumbsPlus.
20091122_M33_Comb-ddpcrv_Neat.jpg
All images copyright William J. Shaheen, unless otherwise noted. Do not use or distribute without prior consent.