Another 2¢, if I may...
I have a 300mm f/9 Red Dot Artar that has served as the long lens in my 5x7 kit for almost 15 years. It's in a Compur shutter. It is very lightweight and "dangerously sharp". The Compur is reliable and a delight to use. f/9 is a bit dark on the ground glass. But the proof is in the negative.
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