Just one additional comment about the F&S. Unless the back has been modified a F&S will not accept the more common Korona holders. Korona and F&S holders have almost exactly the same external dimensions in terms of width but the rib-lock mechanism thate is used to provide light baffling is different on the two cameras. Korona holders have a rib on the holder that drops into a groove in the camera back, whereas F&S holders have a groove in the holders that engages a rib on the camera back.
Many people who own F&S cameras have modifdied the back to accept Korona holders since these are far more common on both the new and used market. The modification is very simply. One simply removes the rib on the F&S back and then routs a small groove to accept the raised rib of a Korona holder.