Sounds like he had a zone plate system in mind for changing focal lengths. There is quite considerable illumination fall-off with ZeroImage 6x12 pinhole cameras, and the zone plate versions are just awful; in my opinion pano is asking too much of the simple mechanism that is a pinhole. Exposure too is quite a task over the predictable results that are the norm with the various smaller-format (up to 5x4) ZeroImage cameras. But a pinhole camera with an interchangeable rollfilm back would be a sight to see; I would be interested in what eventuates with that.