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| p.2 #1 · Nodal point for panos for ZE 50MP and 100MP |
Other than looking it up (if you can find it somewhere), by experimentation. Put the camera on a nodal slide or a full pano head, place a pointy object nearby, line it up in the camera with a pointy distant object, increase the aperture value to let you see both clearly in the shots you take, and start fiddling until you get it right
The point of the near object and the point of the distant object should not move relative to each other at all, when you move the camera from left to right and top to bottom. So, shoot it in the left of the frame, then shoot it in the right of the frame (horizontal for more accuracy), and see how they move relative to each other. Make an adjustment forwards or backwards on the nodal slide. If it gets worse, make an opposite adjustment. If it gets better, make another similar adjustment.
Note that at least in theory, the entrance pupil can move in a zoom as you zoom, and it might move as you focus as well, although I am not sure about that. I have never seen that yet, and I have tried a half dozen different lenses (all primes). In this case, you need to find several points from near-to-far zoom or focal length, and plot the curve, for ultimate accuracy.