I played around with one of these oscilliscope lenses one day with an 8x10 camera and some paper negs. The individual cells on mine resolved an image quite well, with a much longer focal length. Soft, but not as oddly focused as the whole lens together. I have no idea what the design of the lens is, but it seemed symmetrical. Just playing, of course, and no measurements were taken. In the end, I gave the lens back to its original owner. I have too many "sorta' interesting" projects without one more.