FlexAdaptor, electronic shutters and the Phase One One-Shot sync cable
A large format camera is in many set-ups used with a lens and a copal shutter, external or built-in shutter. These shutters can be a weak point in terms of the synchronization signal from lens to the camera back. In general the shutter/lens is the source of most issues using large format but also lens quality is important. Using older lenses and not digital prepared lenses can cause image degration.