The Double Cluster (NGC 869 + 884 and collectively known as Caldwell 14) are two bright open clusters located approximately 7,500 light-years away in Perseus.
Luminance – 12x600s binned 1x1
RGB – 11x300s – 55 minutes each – binned 2x2
285 minutes total exposure – 4 hours 45 minutes
Imaged from Dardenne Prairie, Missouri (a red zone) July 13th and 17th, 2013 and November 12th, 2015 with a SBIG ST-8300M on an Astro-Tech AT90DT at f/6.7 603mm.
LRGB - https://www.flickr.com/photos/dcrowson/23973438865/sizes/l
My original RGB version is here – http://www.flickr.com/photos/dcrowson/9320345235/