Globular Cluster

M 22 = NGC 6656




2011 Jul 01

Optics Skywatcher 13.0-cm reflector f/5 + coma corrector
Camera Canon EOS 1000D modified (ISO 800)
Mount EQ5 Pro
Exposure 110 s x 9 frames
Processing 9 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; severe city light pollution; Click the above image to browse a higher resolution version.




Copyright © Man-To Hui 2011/07/12

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