M 27 = NGC 6853

Place	Mt. Guizi Observatory, Wuchang, China
Optics	Skywatcher 130mm reflector f/5 + coma corrector
Camera	Canon EOS 1000D modified (ISO 800)
Mount	EQ5 Pro
Exposure	110 s x 41 frames
Processing	overall 41 images stacked in DeepSkyStacker 3.2.2 with dark frames subtracted and flatfield divided; fixed with Fitswork V4.41, IRIS V5.33 and Photoshop CS3 Extended; 0.5x resized and cropped;
Comments	images taken by Zhu Mao and processed by me; city light pollution; Click the above image to browse a higher resolution version.

Image	M 27 = NGC 6853
EXIF Time	2010/05/23 18:57:20 UTC - 19:25:35 UTC
Place	Mt. Guizi, Wuchang, Hubei Province, China
Optics	Skywatcher 130-mm reflector f/5
Camera	Canon EOS 400D (ISO 800)
Mount	NEQ6 Pro
Exposure	16^min21^s (30s x 1 frame + ~60 s x 16 frames)
Processing	overall 17 images stacked in DeepSkyStacker 3.2.2 with dark frames subtracted and flatfield divided; fixed with Fitswork V4.25, IRIS V5.33 and Photoshop CS3 Extended; 0.5x resized and cropped;
Comments	images taken by Zhu Mao and processed by me; severe city light pollution; not in focus accurately; obvious coma abberation due to coarce collimation;

Dumbbell Nebula