Lester, Thanks for your explanation. I am asked to follow almost the same but slightly modified procedure with 2 sets of points(pens) as explained below. I believe both makes sense, as Nodal point also known as entrance pupil location will change with focal length, so for zoom lens one has to reconfigure it for different zoom (i.e 17mm, 24mm, 55mm....). So Bernard, thanks for your input, but I will be shooting only with 17-55mm zoom my Panos, so I won't need other Nodal point locations. Looks like I may have to settle for RRS, even though they are more expensive than Bogen, but they ARE well made. Love your Pano shot of Mount Fuji. That IS very unusual, as I have seen only ice capped pics of Mount Fuji. Here is explanation with 4 points.
"Adjust for parallax error - to find and correct the parallax error perform the following exercise using the camera, a tripod with panoramic head, a table and four pens (it is easy to use 'marker' pens which can stand by themselves). Arrange the pens as shown in the illustration below. Position the camera on the tripod using the panoramic head so that the near and far pens can be viewed on the camera's LCD monitor at the same time (or viewfinder if using an SLR). The near pens should be as closer than the rear pens.
Table seen from above and from the side showing position of pens.
Viewing the camera LCD monitor or SLR viewfinder align the pens and pan the camera from left to right so that the pens move from the left to right side of the camera LCD monitor, note the relative movement between the pens as the camera is panned. Using the panoramic head move the camera backwards or forwards until the relative movement between the pens is eliminated during pan.
In this example the camera is too far forward.
In this example the camera is in the correct postion, the camera is rotated around the nodal point of the lens.
In this example the camera is too far back."
I am sorry but illustrations do not go thru'. I hope they still make sense.