Where the light enters the lens, at the front element, is the front nodal point. Where it exits, is the rear nodal point. The centre, where the light crosses at a central point, where the aperture should be, is also a nodal point- could be called the cardinal point. I think you want to pan the camera around the cardinal point. I'm sure there are some which have been designed to do this, but I'm pretty sure that's not the case with the old Horizont which I had once. Irrelevant on this sort of camera anyway, as the image won't require stitching, unless you are operating 3 cameras back to back, as they once did at the peak of Mt. Everest, with three panon wideluxes. It was a clear day too. I don't know where you can find this image, sorry.