I had a very similar lens on a 5x7 Seneca I recently sold. The lens had no manufacturer's name on it, but it was in a similar Wollensak shutter. It is a convertible rapid rectilinear. Mine was capable of making very good images. The corners were a little soft at wider apertures, but at f/16 or smaller, it was very sharp.
American scale: 4=modern 8, 8=modern 11, 16=modern 16, 32=modern 22, 64=modern 32, 128 = modern 45, etc.
Last edited by pgomena; 11-24-2012 at 02:11 AM. Click to view previous post history.
Reason: corrected an error on the aperture number conversion