I didnt know the group existed. I have been using a Sinar since 1983. Im a professional industrial photographer. I currently own 2 and half Sinar cameras. An F, a P and half a Norma. All 5 x 4 Im happy to advise any one as I have extensive knowledge of them including service and repairing them. My first advice is if you buy one and it feels stiff, do not force the gears. The damage is quick and expensive to repair. The grease solidifies so when you force it especially on the rear standard you can damage the gears and the depth of field scale. I look forward to meeting you guys.