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Many of the stitching problems reported here are caused by parallax. For a panorama all images should be taken from exactly the same viewpoint. More in particular: the camera should be rotated around the 'no parallax point' (sometimes referred to as the 'nodal point') of the lens. For most lenses this point is located near the front element. If the camera is not rotated exactly around this point, parallax errors will occur, preventing a perfect stitch. Especially indoors a panoramic tripod head should be used to prevent parallax.