text: * Positions of the CBED disks are the same as the positions of the Bragg peaks and are given approximately by the relation:
  where  is the distance between the crystallographic planes ,  is the Bragg angle,  is an integer, and  is the wavelength of the probing electrons. 
  * The beam convergence semi-angle  - is controlled by the C2 aperture. The probing beam convergence semi-angle, , is of the order of milliradians, ranging from 0.1˚ to 1˚. For small convergence semi-angle, the CBED disks do not overlap with each other, whereas for larger semi-convergence angles, the disks overlap. 
  * The diameter of a CBED disk is given by the beam convergence semi-angle :
  * Defocus : The distance between the crossover of the probing beam and the  position of the specimen is called the defocus distance . The sample can be moved along the  axis. At a defocus distance, both the direct space and reciprocal space information are visible in the CBED pattern.