I figured out a way to mount my various barrel lenses in front of the packard shutter that came with my Cambo. The main lenses I wanted to use this way was my Nikkor. 360mm in shutters seem to be expensive and big. Outside of the no longer produced Fuji. All was going well until I went to adjust the aperture on the Nikkor. It's doesn't change. Does anybody know what I could have screwed up? It worked a couple days ago.