Yeah, it turns out that it's very difficult to design a compact 4x5 back. The most compatible option is Graflex, but it would really increase the size and cost of the camera. Now instead of a simple back and one metal spring, you need large angled wings to the top and bottom of the back, with sliding metal tongues. It would be a larger, $129 camera instead.
We figured that most people would be using standard film holders, so that was our target. However, we wanted to make it easy to adapt. That's why we opted to attach the spring back with three standard phillips head screws. You can easily remove the spring and reattach it in the field if needed. Once it's off, you can use heavy rubber bands or ball bungees to attach nearly any 4x5 back ever made. I haven't yet encountered an incompatible back.
Once the alternate back is attached, odds are it will be heavier and/or larger than the rest of the camera combined, so it makes sense to hold it by the back. I've done this with the Calumet roll film holder and the Fuji QuickLoad holder. It works well!
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