Sincerely sorry to PM directly. I know your mind is set on Cambo WRS and my guess would be you are from US albeit you don't have access to a Sinar arTec. And if I am wrong and you have tested the ArTec, then you must have a very good reason for Cambo WRS. For arch/interior, it is still the best sol'n in terms of GG rather than Veiwfinder. The other option as you know is LiveView tethered to your laptop! cheers
Richard
Richard