Quote Originally Posted by Matthew Rusbarsky View Post
Could be wrong about this, but the Avus and Bergheil have a standard back (as standard as those things were at the time) so plates were interchangable between the cameras along with the Certo Bee-Bee and Nagel Recomar. Makes finding a rollfilm back much easier.
This is right. The only thing I can't speak to is the Certo Bee-Bee, but I regularly interchange backs and holders among a Bergheil, an Avus, and a Recomar.

I may be wrong, but I think only the Bergheil was available with the Heliar, which (at least in a good sample) can be one hell of a lens. (The Avus seems usually to have a Color-Skopar, which is a perfectly good Tessar type.)