Quote Originally Posted by StoneNYC View Post
I can GUESS at which are "the Chinese" backs, but it would be helpful to know which you've specifically used.

Gaoersi and DaYi. These were proprietary with 617 cameras, rather than for 4x5/5x7 cameras; however, it was design that I was suggesting you consider.

To be honest, I think the whole film flatness thing is a bit of a myth. As I wrote, decent spring pressure, both on the plate(s) and the roll, along with well machined film track, virtually guarantee flatness.