Abstract: The device permits swing, shift, tilt and rise-and-fall movements between a lens and a motion-picture camera to manipulate focal relations and image shapes. Preferably the device rests on rails (called "iris rods") of a balance plate or base--secured under the camera--or some other track, similarly mounted. If so, the device has a first intermediary element preferably mounted to slide fore-and-aft on the track relative to the camera; and other intermediary elements mounted in a sequence preferably from the first element for translation and rotation relative to that element--ending in a lens-board mount for mounting a lens. Also in balance-plate mounting the device preferably includes a bellows whose front end joins the lens-board mount and whose rear end holds an adapter to engage the camera lens port. Preferably the device has a yoke (preferably flat and rearward-extending) for, e.g.