Thanks to Eddie I've now got a working shutter behind this beast of a lens.
I ripped this off a 6x6 projector, took a shot with a darkslide-as-shutter, and it definitely produced a nice image on 5x4. Now it's in a shutter I should be able to produce proper photos with it.
Need to find a Copal #3s flange/retaining ring (I missed one here a week or so ago). Probably try to fix it to a lensboard this evening.
The shutter is so big my Korona 5x4 won't close with it on! The diameter fouls the focus track folding upward. I hadn't thought of that....
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