tor kviljo , Sep 11, 2001; 03:39 a.m.
The Mamiya RB and the Horseman both uses a 2"x3" Graflock-back, so the film-plane position of a RB-67 film holder is the same as the ground-glass position of the Horseman. Likevice, You ought to be able to use the Horseman's 6x7 cm roll-film- holder on a RB-67 camera. Also Graflex made roll-film holders for 2"x3" Graflok-backs (only the film-holders with lever-type film advance can be recommended, the ones with "nob-type" film-advance is reported to be haunted by film-flatness-problems). Due to the sheer body-size of the RB-film-holders not all RB-67 film-backs can be used on the Horseman. Personally I found that the 70mm Mamiya RB-film-holder was to wide (due to the big film-chamber for the 70mm cassettes) to be able to mount on my Horseman 970. I advice You to try with the RB-film holder in question befor buying it.