Schneider Xenar 15cm/3.5 on Speed Graphic

[RLangham]

Well, I was wrong, that's apparently a Compur #2 shutter... ask me how I know... well, I had seen the "II/5" on the chart above and assumed it referred to a different scheme of shutter sizes, and I'd also seen references to the 15cm/3.5 coming in a Compur #1, so I neglected to actually find my vernier calipers and actually measure the OD of the rear barrel.

At any rate the #1 board I ordered has been modified to fit the shutter (it wasn't old and anyways it was $20) and my preliminary examination on the ground glass looks good. In a minute I'm going to take it outside and see what vignetting we have when stopped way down.

 

[MARTIE]

I'm pleased you've got it sorted.

BTW, the exact calculated diagonal measurement of the exposed area of 4×5" film is 153.05 mm.
While the lens is said to have a circle of good definition stopped down of 160.35mm.
Therefore, there shouldn't be any apparent vignetting on the negative when the lens is centered and stopped down, even at infinity.
As you know, the circle grows when focused closer and there will also be a circle of illumination. I'm sure it will be a great lens to explore and use at various distances and apertures. And as vintage lenses tend to have lower contrast, that is also something to add to the mix.
Have fun and if it works out, it would be interesting to see some results.