Home-built 4x5 camera. Based on the 150-year old principle of the Sliding Box camera.
The lens is a ≈165mm Petzval lens with engraved aperture stops. It does not cover infinity (I have a 200mm lens for that) but acts as a portrait lens.
The back came off a Cambo technical camera and takes standard 4x5 film holders, to straighten things out at the focus end.