Amadeus - Thank you for the info! So if I understand what you're saying about the differences, it is only the actual size of the rear mounting frame? I wouldn't have thought it would be Sinar's method of mounting, which is pretty much the same 'groove with locking bar" for standards, backs, lensboards, etc. As long as it's only the size (difference between the Sinar Met. and non-Met. back bellows), I can verify the size from ecbyonline.
In fact, here is the size they gave me for the back frame of their standard "Sinar P2" bellows, which is pictured on their site attached to a metering back. They're saying the dimensions of the rear frame of their bellows is 324 x 324mms, or 12.75"x 12.75". Does that sound like the correct size for the metered back?
Thanks a lot for helping with this question, I'd really like to order a set of these, but as mentioned earlier in this post, I don't want to order all the way from China only to get the wrong thing.
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