Does anyone use xray film for pinhole work? I made an experimental pinhole on the weekend and was really surprised by the results. I cut down some xray film I had and in bright sunshine got an exposure of 6 seconds which was quite a good negative. I'm not sure how xray film responds to long expures or for that matter how to calculate the exposure in less light so if anyone can offer any suggestions would be appreciated regarding exposure and reciprocity. The pinhole is about f220 on a 5x4 giving roughly 90mm.
Also, to get good coverage on a 10x8 and have the equivalent of a 150 mm lens any suggestion for pinhole size? I have the back from a 10x8 so I can see it becoming a pinhole camera in the not too distant future.
Steve
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