While I am concentrating on 5x7 and 4x10 I do have an interesting lens in a Compur 0 shutter. The lens came from a Mamiya Press and I remounted it in the Compur. The lens is the 50mm f/6.3 that is purported to be of the Biogon design. It was designed to cover 6x9cm. I haven't tried it yet but it should make a nice circular image on a sheet of 5x7 film. Didn't the original 100 shot Kodak box camera create circular images? Why aren't circular images more popular, after all when I look up from typing this on my Macbook Pro I see a wide expanse that is kind of circular and is certainly not a rectangle!