Thanks for the answers. So I'll probably just see how close a focus distance I can get with a moderate extension when the lens arrives, obviously there's no sense making an extension tube much longer than maybe 100mm as that would bring the weight of the lens too far forward for the front standard to comfortably support and probably also cause vignetting.
The reason I want to try this lens is they are available cheap and I like to experiment and tinker with weird old things (which is, after all, why I started film photography again after 20 years of shooting just digital and why I got into large format). If I can't get it to focus closer than a few meters then so be it, I'll use it at longer distances. Or maybe I'll build an 8x10 or maybe a big paper negative camera if I can't use the lens for the Speed Graphic.
I know the longest "sensible" focal length for a Speed Graphic is around 250 mm but I think that would not make a huge difference from the 180 mm I already have. A smaller, shuttered 300mm would on the other hand have the same problems with maximum bellows extension. Also shuttered 250mm lenses tend to be quite expensive (the cheapest I could find on Ebay is about 260€+40€ shipping from Japan+25% tax and maybe 20€ declaration fee if the seller chooses to use DHL as the Japanese sellers these days quite often do as postal services have become kind of erratic lately). The Industar I got for about 100€ from Ukraina. And as the camera has a focal plane shutter I'd like to experiment with a barrel lens.
Also I think the camera would look even more cool and crazy with a huge hunk of a lens sticking out at the front.
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