I'm sure I asked you this before but I can't find the answer - what't the focal length of your pinhole? Looks very wide. I have a CB-70 back & will eventually (soon I hope) make a pinhole camera from it. I want this super-wide effect too. I think you sent me pics but I can't find them. :(
^
this is a 0,16 pinhole size with approx 40mm focal length.
The usual focal length for this size of hole should be 20 mm, so I tried but the results are not good yet. I have to figure out why.