We are having the same discussion in another thread. After making adjustments his panoramas started looking a lot better.
Sorry Kevin, I overlooked your website directory link.
Theory is: When the tripod head is a full circle [not segmented like below] and you can see the pan head center rotation shaft as a complete metalic circle.. then you have removed the parallax and have the lens nodal point on station. THEN the stitching seams will start falling into place with precision and there will be significantly less post photo shop processing.
Ok lets do a small bit of subjective analysis on Kevin's tripod head images. I made these by loading each into Panoweaver 4 then viewing them in the viewer. I tilted down to look at the tripod cap. Then I did a screen capture of the nadir. Took all of the screen captures into photoshop and lightened them so you could see more of the panorama head.
First off: you might consider moving the center line of the lens more to the left or right... the lens is not centered properly because the | | marks appear to all be the same across all 3 images. The estimated distance offset appears to be only 2 mm. Make note of and temporarily mark the current Left to Right position. And then move the vertical bracket left 2mm. Take a new panorama and view the Nadir area in Panoweaver Preview. Take note if the offset difference is greater or less than shown below.
Observations about the forward/ backward nodal point. It appears that you are seeing LESS of the tripod head at the 65 mark. You start to see more at the 75 mark. Even more (notice screws ?) beginning to show at the 80 mark.
I am not familiar with what the actual top of the head looks like.. but I am sure that there is a CENTER mark at which the entire head rotates around. Looking through the view finder.. you should begin to see that center mark when you are approaching the nodal point. The Sigma 8 is 180 degree angle of view.. so you should be able to see the center mark at the bottom of your image.
Here is 65-r1765. Left to right axis is not center of lens axis. Hence the double tripod leg and the tripod head is not full circle. 4 image slices are offset maybe by 2 mmm.
Here is 75-R1765. as you move the camera BACK you are starting to see more of the tripod head center area. Also you might consider shortening the handle.. it almost extends outward beyond the tripod legs
Here is 80-r1765. Here we are starting to see more of the tripod head center area.. possibly these are screws or the pan head center shaft. Adjusting the bracket either Left or right by 2 mm should close the center area to where you see the full center shaft of the pan head.
Forum Moderator for
EasyPano - Panoweaver