5 - 10 min. exposures at Gain 1, Offset 70. TEC-140 (980mm, f/7) and no focal reducer, yielding 980mm, f/7; Q453HR color CCD camera. No darks, no bias frames and no flat frames applied. Post processing: Bad Pixel removal in Nebulosity2; aligned and combined in ImagesPlus using IP 3.75; DDP, color balance and curves in Nebulosity2. Final contrast and slight sharpening in ThumbsPlus.
Image cropped from original of 3040 x 2016 to 1024 x 768.

20090419_M57-Comb-Neb-adjcr.bmp