Hi, I'm planning on designing a 4x5 multi slit pinhole, with two slits, one vertical and one horizontal, spaced a few centimeters apart from each other so all the film sees is one square pinhole. Has anyone attempted this? I've found limited information on it, but it has been done and the results are very interesting, with a perspective skew due to the focal length difference. The thing I'm not so sure of is the distance between the pinhole plates before major blurring occurs. Any info would be appreciated. Thanks.