The direction and amplitude of the strobe was caused by the vector sum of the peak current values in the four deflection coils
This is accomplished via deflection coils
, which bend the beam away from the optical axis.
The electron beam is shaped by an electromagnetic condenser lens and directed by deflection coils to uniformly irradiate the specimen.
Special deflection coils make it possible to vary the beam entry into the material over sufficient angles to obtain pairs of images for stereo views.
This is due to the lack of large deflection coils
required by tubes.