Lots of good answers. It seems you have several options, new and old, small and large, to consider. One more you might want to look for is the 240mm f9 Germinar-W. It is very similar to the G Claron in terms of size and coverage, but is a newer design that is multicoated. Like the G Claron, if you can find one in a barrel mount, the cells will screw right into a standard Copal No. 1 shutter.