That's a nice looking lens at a good price. If I were in the market I'd jump on it but I already have the 610 and 760 both mounted in shutters. How would you mount the 890 on a lens board? The Toyo boards are 158mm square - too small for a 200mm retaining ring to fit.
You would need to make an extension box. It would also help to turn the front standard around, so that the depth of the box is minimized. The diameter of the front and rear lens elements is only about 80mm, so there will be no vignetting.
Hello, I would very much like to purchase this lens from you. I live in the UK and would need it posting there. I can pay via WISE. Please let me know how you would like to proceed.