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Is it software or 180degrees FF lens?
There are many factors that one needs to take into account when creating a pano. First of all you need to keep the no paralax point (npp) still while rotating the camera. This is quite hard if you are doing it from hand, that's what the special tripod head is for. (Although I did manage to shoot panos from hand in Spain, when I didn't have the pano head yet.)
The second most important part is the actual stitching. I use PTGUI for that. What is very important, is that I always export blend layers separately, so that I can move the stitches when necessary. After that I have a stitch error detection script that I have written. It points out every single bit of error, so that nothing gets past my inspection. When necessary I either move stitches by copying from the separate blend layers, or use traditional photo shopping techniques to remove artifacts.