To follow up:
I've had the Novoflex adapter for several weeks, and I'd have no reservation using it with lenses up to 250mm.
But my goal was to be able eventually to use something 350mm or longer, if I came across it at an attractive price. For all shorter focal lengths, I've been quite happy with Contax versions. I don't currently have any Hasselblad lenses.
What's my concern about the Novoflex? The two main pieces of the adapter are fastened together with four 1.5mm screws (oriented radially, nicely countersunk, and apparently of polished stainless steel). I tell myself that I shouldn't worry about shear stress on these screws, for the Contax portion of the mount forms a throat that nests snugly within the Hasselblad portion, extending as far forward as it can and still allow clearance for the Hasselblad bayonet blades. The adapter's fit to the Contax body is indistinguishable from that of a native Contax lens, and I've no reason to doubt a correspondingly good fit at the Hasselblad end.
I'd suspect it's silly to be nervous, here, were it not for the fact that the lenses 350mm and up are rare enough that their mass and moment may be outside the (unstated) design limits for this adapter.
It would be useful to know whether the Zoerkendorfer adapter is also a two-piece affair, or whether it's monolithic. Anyone?
-H.
