2theta-max is the scattering angle corresponding to the Q-range; it is the 2-theta at one edge (not corner) of the image assuming that the beam center is in the center of the image. It depends on the camera length; for small- angle scattering 2theta-max will be small while for wide-angle scattering it will be large. The Q-range and Sample-Detector distance are automatically updated every time 2theta-max is changed, and vice versa. |