SLR medium format all mechanical cameras (no battery needed) with interchangeable finders, finder screens, lenses and film backs. Flash sync at all speeds with mechanically controlled in-lens leaf shutter (no shutter in camera). Shutter-mirror cocking and film advance require separate action (unless using the 120/220 Power Drive Magazine). Unique rotating film back allows for vertical or horizontal orientation of film while camera position remains unchanged. Mirror lock-up, flash shoe, multi-exposure capability, rack and pinion bellows focusing.