Having just read another thread about G-Clarons I have got quite excited! I rescued 3 (150,210,240) from an old flatbed camera that was being scraped! At the time I thought they were just enlarger lenses, and they sat in my darkroom unused because I did no large format. Having just bought a 54 camera (see my other thread) can I use these lenses? from a quick search they seem to have a v.good reputation. As they are they have no shutter mechanism, but they are mounted in an aperature ring. Can I unscrew the front and back elements and mount them in a copal shutter?