Hi All,
I'm setting my sights on a 6x17 view camera and its looking like a new Shen Hao or used Ebony. I'm checking out the Ebony 617S which is incredibly expensive and hard to find used vs the Ebony 45S or 45SU with a 617 roll film back.

Is there something special about the Ebony 617S over the Ebony 45S besides the fact that it comes with the 617 roll film back, I don't understand why its nearly 2x the price of the 45S. I thought maybe it'd be lighter but its not, its even heavier than the 45S/SU.

Does the 45S/SU not support the full width of the 617 rollfilm back?