Focus cam will fit on 4x5 Linhof Technika IV, V and Master models. The leading edge will need to be filed down to calibrate a specific 90mm lens. I will provide instructions on how this is done on request. This version is intended to be used with the focus bed dropped at 15 degrees as Linhof intended it to be used with wide lenses. The cam is functionally identical to original Linhof cams. If you prefer to use the camera with the bed at 90 degrees, select my version of this cam for level bed. Available in Aluminum or Bronze. Either will work fine. Bronze is stronger, but costs more.