In this tutorial, I’ll show you how to adjust / calibrate your panoramic tripod head to find the no-parallax point (also incorrectly referred to as “nodal point”) for your lens. This is very important to minimise the stitching errors in your panoramas.
The process can take a little while, but you’ll hopefully take away some tips on how to speed it up and reduce the amount of “trial and error” involved.
Now, all this no-parallax-point-business can be quite confusing and I’m not terribly good at explaining it. If you’re the technical type, I would really recommend you read this very detailed article by Michel Thoby.