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.Quote:
Originally Posted by Rlibersky
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.