Wikipedia: https://en.wikipedia.org/wiki/Whirlpool_Galaxy Photo: 13x30s, ISO12800, f/5.6, Nikon D5 DSLR, Nikkor 300mm 2.8GVRII lens, Avalon Linear mount, IDAS LPS D1 QRO filter.
6x170s exposures at ISO3200, 300mm and f/4
