I have one of these lenses which I had mounted in a Wollensak Pi-Alphax shutter for use on my 8X10 camera. The 210 mm Wide Field Graphic Raptar has an image circle of about 15 inches, it is small and lightweight, and mine produces exceptionally sharp negatives even at infinity. The lens is a reverse Dagor design, and was produced originally for use on graphic arts cameras. My copy of the lens was professionally mounted in the shutter by www.lensn2shutter.com. It needed a thin shim to ensure the rear cell was at the proper distance. I've used the lens with 4X5. 5X7, and 8X10 backs, and I have been more than pleased with the results. The recommendations for using a Packard or Sinar shutter--or simply a hat--make sense as a means for testing the lens.