This is a combination of 2 nights' imaging: 10 - 10 min. frames from 22-Mar-2010 and 6 - 15 min. frames from 13-Apr-2010 (3+ hours). Equipment: SBIG ST-8300M (monochrome) CCD camera at -20C. Baader 2" UV/IR filter. Telescope configuration: TEC-140 (980mm, f/7) with the AP 27TVPH .75x focal reducer, yielding 806mm, f/5.76 and an image scale of 1.38 arc-seconds/pixel. Mount: Losmandy G11 w/Gemini. Focused using a Bahtinov focus mask. Post processing: bad pixel removal in Nebulosity2 using dark frames compatible with the original exposures; calibrated, aligned, combined and DDP applied in ImagesPlus 3.82 (Auto Image Set Processing). Curves in Nebulosity2. Image cropped from original of 3352 x 2532 to 1280 x 960.

20100414_M66_CombExcAvg-ddpcrvadjcrp.tif