This adapter allows use of lenses mounted on 4x5 Pacemaker Graphic lens boards to be used on Graphic View Cameras as well without having to remove the lens from the lensboard. I believe it will also work the same way adapting Pacemaker lens boards to Anniversary Speed Graphic cameras. For someone with a 4x5 Pacemaker Graphic and another camera using Anniversary Graphic type wood or metal lens boards, it is a very useful accessory. Includes a Pacemaker lens board with hole for No.1 Shutter. One small hole has been taped on the back side and is light tight. $60 for adapter and lens board shipped within the USA. Prefer to sell within the USA or Canada. Please reply by PM.