I have a Cambo WRS 1250 with a phase one mount adapter that was designed for IQ2 backs, can I use an IQ3 back with the older phase one mount adapter
If you are referring to the size of the pin opening, then the newer Cambo Interface Adapter has increases in size to accommodate the extra pins of the IQ3. As does Alpa, as does Arca, ....
With that said, I have many clients still using old school adapters with IQ3 and IQ4. The pins compress and so far we have not had any issue reported from any client who used the older adapter with the newer IQ backs.
Steve Hendrix/CI