Hi Sparks
I have just had a further thought about Mamiya C330 cameras which may be of use to you. The focusing screens for the C330F are not interchangable with the C330s, and vice versa . The distance between Mamiya lenses is 50mm which is easy adjust on the centre column of a tripod. If you think about buying a wide angle lense I recommend you go for the 55mm rather than the 65mm which is a bit soft, and not worth buying if you have the 80mm standard lens, and with the bellows extended the 55mm gives you 1-1 for macro- photography.