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The Ring Nebula on not-as-clear-as-forecast night in London. M57 was the best available target to image through the murky sky but it's come out much better than previous attempts.

post-33955-0-11099500-1438412818_thumb.j

17 x 4 minute exposures at 800 ISO
 3 x 8 minute exposures at 400 ISO
16 x dark frames
10 x flat frames
46 x bias/offset frames
92 minutes total exposure time
Guided with PHD
Processed in Nebulosity and Photoshop
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