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Messier 57
(click for higher resolution image)

Optics: AG Optical 12.5" iDK @ f/6.7 l=2130mm
Camera: QSI 683wsg @ -25C
Filters: Astrodon Tru-Balance Gen 2 E Series LRGB
Mount: Astro-Physics AP 1100GTO
Guiding: OAG with Starlight Xpress Lodestar X2 Guider / PHD2 Guiding
Location: North Attleboro, Massachusetts
10.75 hours exposure over 9 nights, 2015-04-22 - 2015-05-22
L:R:G:B 5h20m:1h45m:1h50m:1h50m (64x5m : 21x5m : 22x5m : 22x5m) binned 1:2:2:2
Captured with Sequence Generator Pro
Processed with PixInsight and Photoshop CS6