I have one I’m using in a 7x17 adapter for my enlarger. At 2x magnification, it has great resolution at the corners and less than ½ stop light falloff. Schneider claims around 70 degree coverage, and I know it can do better than that. I have not tried it on the camera yet. I have heard it does not fit a Copal shutter? Does anyone know for certain? See http://www.schneiderkreuznach.com/ar..._claron_wa.pdf