Sirius Glass
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Pair of fully working C33 Mamys by Nokton48, on Flickr
Now I have a pair of C33 Mamiyas. The idea here is to preload the cameras so they are easy and quick to interchange. Both of these are fully tested to the point of shooting some Ilford Pan F through each. Before I changed to Hasselblad the idea was multiple bodies, not multiple backs.
OR mount them on a bar and take stereo photographs.