Nikon D3 100 jumps one degree to the right. How to adjust it?

Such a small error is inevitable. If we must avoid it, there are three ways. First find a professional level, not only with the desktop level, but also with the Yuntai absolute level. (PS: This trick is the most expensive. Perhaps only professional studios have such equipment, about tens of thousands of dollars a set. Secondly, using the horizontal line function of the camera itself, horizontal lines appear in the picture, but because the camera itself has few horizontal lines, the water level is judged by the human eye, and there may inevitably be an error of about 1 degree; The third and simplest method, PS post-production, is to make absolutely horizontal cups by cutting or free deformation.