This is 3 x 5minutes and 4 x 10minutes mostly ISO640 (sweet spot ISO for a Sony A7r2). Zeiss 55 1.8 lens at F2.8.
Piggybacked on my AP1600 mount unguided. 3 of the 10minutes subs were high cloud affected but still had something to offer. I plan to add to it next clear imaging night at my observatory.
Processing in Adobe Lightroom and Photoshop cc 2015.5
http://www.pbase.com/gregbradley/image/164006269/large
Greg.