Hope I spelled it correctly, there are a verity of spellings on th web. I'm wondering if my 4x5 Shen Hao will accept a Horseman 612 roll film back. The Horseman uses the Graflex system. My goal is to eventually get a Horseman Pro 612 system and when I do I'll have this as a back-up or possibly for N+1 Zone Systems exposures. 2 backs are better than one, different film? I know Shen Hao makes a 6x17 roll film back, too big, bulky and not usable on another manufacturers system. The Horseman Pro 612 has some advantages including interchanging lenses and backs with the Shen-Hao. (if I'm lucky). If it turns out the Shen Hao does not accept the Horseman roll film back, does the Chamonix 4x5?