I tried to do a 360 degree pano. Somehow I always get a stitching error (see photo here:http://farm5.static.flickr.com/4122/...7b6258a3_b.jpg). Was it a levelling, stitching error or wrong NPP? I did the traditional way of finding the NPP and the direct method of checking it by using a pen's barrel. I was using a Canon Rebel XTi w/ EF-S 10-22mm mounted set at 10mm. f/8, ISO 100. I used PTGUi for stitching and optimized using CS3. Any comment, advise or help is highly appreciated. Thanks in advance.

Ruel