Thanks useful information: 
I will add also that parallax is caused when we look at things cause our eyes are spaced apart. This spacing allows us to determine distance and depth. A camera lens (unless 3D) does not have two lenses side by side, so parallax is of much lesser concern. Most people can get away with using a standard tripod to get good images for stitching into a panoramic. If you really want the best, seek out a specialised panoramic head for your tripod, which works by using the sensor plane when panning the camera between shots to ensure the best possible images for stitching.
Parallax is a very minor part of getting the result you want, cause parallax is caused by two lenses set apart (like eyes), or one lens moved left or right between shots. So if you hand held your camera and took a shot, then moved 15cm to the right, and took the next shot, you create parallax issues. If you use a tripod with a panoramic head, then you alleviate parallax issues, and you do not need to know where the entrance pupil is, or what NPP or LPP even are.
http://www.ebay.com.au/bhp/panoramic-head
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