I sold this lens, I bought some years ago, thinking that it could cover my 8x20" camera, but it doesn't. It cover perfectly 8x10". The lens is good, and work perfectly, sharper and with good micro contrast. Shutter works without problems to all times. Lens aperture are smooth, the only problem is that the shutter doesn't have the right f-stop scale, but it easily understand the right one. Sold for $ 300,00 + 20$ shipping world wide.
Stefano
Stefano