Folks, I'm well acquainted with thread drift. Even though I started this discussion I don't feel that I own it or can control what's posted in it. I intended it to be about lenses that we know from experience aren't the best, not that we don't like because of quasi-religious belief. I'd appreciate it if we could stick to that subject and not slander each other. I'm tempted to call names at times but it really isn't appropriate.
With that in mind, let me tell you about my not-so-beloved 1.75"/2.8 Elcan. It was made for the Vinten F.95 aerial camera, which shoots 6x6 on 70 mm film. The first one I saw belonged to my late friend Charlie Barringer. He'd stuffed it very crudely into the front of his Miniature Speed Graphic. After looking at the images it put on the ground class he concluded that it just covered 2.25" x 3.25". I looked, reached the same conclusion and coveted one.
Not long after that an unlikely string of coincidences brought one to my house. I took it to Woonsocket to have SKGrimes put it on a 2x3 Pacemaker Graphic board. It eventually came back, I put it on my little Speed and took some pictures. It doesn't cover 2x3. It illuminates nominal 6x7, doesn't really cover 6x6 and it has heavy barrel distortion. It isn't that sharp either. The best I can say about it is that it seems to be the shortest lens that will focus to infinity on a 2x3 Pacemaker Speed Graphic and that it is marginally acceptable on nominal 6x6, its intended format. It can't be used on a 6x6 SLR, not enough back focus. If you have the opportunity to buy one, run away.