I've got the Caltar IIN version of the 210mm Sironar N, and two Meridians (a 45B and a 45C). The lens just fits inside these cameras when they're folded closed, but only due to a custom aluminum board I machined out of 1/4" plate that has a 3/16 recess. I'd expect that among folding metal fields few or no other cameras are going to close with this lens mounted. (A Nikon SW 90mm f/8 fits inside a closed up Meridian on a flat board-- but not with the standard Nikon lens cap!)

It's my understanding that Linhof Technikas won't fold up with Sironar 150mm's mounted on flat boards.