This image of IC 5146, the Cocoon Nebula and Barnard 168 was shot with the Nikon D810a astrophotographic DSLR camera on loan from Nikon for a review of the camera that was just published in the February 2016 issue of Sky & Telescope magazine.
http://www.astropix.com/IC5146.html
Click on the link to see a larger version with more information.
This is a stack of 32 five-minute exposures for a total exposure time of about 2.66 hours taken from my magnitude 20.80 observing site in southern New Jersey. It was shot with a 5-inch refractor working at f/4.7 at about 611 mm of focal length.
The Nikon NEF raw files were calibrated with darks, bias and flat-field frames then aligned and stacked in Images Plus Images Plus v6.5 beta. The stack was further processed in Photoshop CC 2015.
Jerry