I've decided to have a go at large format as I need movements for a project I've started working on. I've invested in a Sinar Norma (unbelievably cheap) for studio type work and certain architectural work. I also picked up an old MPP Microtechnical for carrying around. However the MPP is a MKIII and looking on the MPP users club it states that the MKIII doesn't have an international back. There is a section on registers http://www.mppusers.freeuk.com/registers.htm that states that lenses may have to be stopped down when using modern holders. Does anyone know what the register is and how it can be adjusted? If it's not possible to use modern film holders with this camera it will have to go on the auction site.