I am interested in putting a pinhole on a large format (5x7) camera in order to utilize rise/fall to change perspective. I would like to be able to see the results of the pinhole shift on the ground glass of a conventional LF camera, but of course the actual 'taking' pinhole does not allow enough light through to see anything. I have heard tell of a 'viewing' pinhole, presumably for exactly my purpose. I presume it is oversized enough to provide a visible image.
Has anyone used a viewing pinhole? If so, do they actually work? Is there a formula or starting point for finding the correct viewing hole size, say for 125mm taking hole? Would I be way better off using a comparable lens for composition? I am assuming that be the viewer a pinhole or a lens, the coverage of the taking pinhole would have to be determined by trial and error. TIA, CXC
