Frank, I used the 503CW with a kodak and a PhaseOne back without an issue. My H3D has a removable back and I have not had 1 issue with it. the camera was designed to have the back removed and replaced, not so with a 35mm camera. Franc Flipsen From: Frank Filippone Sent: Monday, November 07, 2011 8:50 AM To: hasselblad@xxxxxxxxxxxxx Subject: [HUG ] Digi-backs,.,,,,, I have spent a lot of time getting my fixed back 35mm camera in alignment to make properly focused exposures. ( trips to the manufacturer) For the Hasselblad,, with a removable back…. What is the experience with holding focus alignment? Frank Filippone Red735i@xxxxxxxxxxxxx