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One from Feb/March 2016 and my first attempt at experimenting with colour balance using the freeware program eXcalibrator.  The image is a H alpha blend LRGB and represents about 17 hours. LIGHTS: L:26: , R:31, G:11: B:12 x 600s and 12 Ha x 1200s all at -20C. 

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From the album:

Deep Sky II

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Photo Information for M101

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