Globular Cluster

M 4 = NGC 6121


Image M 4 = NGC 6121
EXIF Time 2010/05/23 16:39:40 UTC - 17:33:06 UTC
Place Mt. Guizi, Wuchang, Hubei Province, China
Optics Skywatcher 130-mm reflector f/5
Camera Canon EOS 400D (ISO 1600)
Mount NEQ6 Pro
Exposure 20 s x 29 frames
Processing 29 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;




Copyright © Man-To Hui (Wentao Xu)

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