" those sold with cameras or by camera manufacturers such as the Linhof Super Screen"

We have not made the Linhof Super Screen for over a decade. It is not available nor is the cover glass and you would not be able to stilkl find a dealer with one. The factory and we have not had one for many years. Linhof does supply a very fine ground glass with their cameras and does offer a Fresnel screen for them. The Fresnel is an accessory. It is not supplied with the camera.