I only used a bag bellows on my Sinar 4x5 for wide-angle interior shots requiring quite a bit of rise or other contortions. The conventional Sinar box bellows
which comes standard with F,C,P, and X cameras has problems if it's scrunched up. The older tapered Norma bellows is much more versatile at either short or extra long extensions. Too bad they stopped making it, but apparently did so due to cost. I lucked out finding a couple of mint ones. But in the past I worked
mostly with long lenses, and Horseman offered a 28-inch bellows that didn't sag (no need of an intermediate support standard), and fit Sinar too.
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