The distance is 3.25 inches from the pinhole to the film. I placed the pinhole behind the aperture slider thing so I don't think that is the issue. The pinhole is however about .75" inside where the lens used to be (which I removed). I thought originally that this would cause a little vignetting but not as extreme as my results. Im pretty frustrated because the little bit of an image I did get looks beautiful. Anyone have a suggestion on how I could possibly fix this?