Hello, I bought my NN5 head a couple of years ago. When I first set it up using my Nikkon D80 with a 10.5 fisheye I remember referencing a table which told me where to set the stop plates on the lower and upper rails. Since I have always used that set up I've never needed to change the position of the stop plates. However, now I would like to experiment with a longer lens and do some gigapans, but I can not find that reference chart. I see on this page http://www.nodalninja.com/support/camera-settings/42/ you are referencing the distances "A" and "B" but where is the chart?