Quote Originally Posted by Rlibersky
Has anyone built a LF pinhole? I have some film that is 10.5in x 120ft. I am thinking of building a 10.5x18 inch camera. My question is should I make it so the film plane at the same distance from the pinhole on a circle or flat like it would be in a normal camera. When I 've used shorter length, ~300mm, pinhole on my 8x10 the edges seem to get distorted. Was this a function of a badly made pinhole?
My completely unqualified opinion is that yes, you will need to make a curved back for the film plane to maintain the consistent distance from pinhole to film.

Having said that, it also seems as though at these larger-than-usual dimensions the edge of the pinhole would really need to be clean. I think a pinhole with ragged ragged edges would be very obvious at that size.

Also, if you missed it, scootermm had a similar project a while back.