A camera assembly, preferably a cinematographic camera assembly, comprises a camera housing and a plurality of interchangeable lenses which can be attached to the camera housing for capturing an image. Each lens has a body and a lens system comprising at least one lens element that is movable relative to the lens body to alter the focus distance of the lens, the lens having a focal length that differs from the focal length of the each other lenses. Each lens has a focus scale on one of the lens system and the lens body that comprises a plurality of focus distance marks, and a focus index mark on the other of the lens system and the lens body.