It has been reported previously (1,2) that, as a result of the high
degree of coherence of the incident beam a number of novel interference
effects have been seen in shadow images and convergent beam diffraction
patterns formed in the HB-S STEM instrument and observed by means of the
optical analyser system which incorporates an image intensifier and a low
light level TV camera. In this paper we report further new interference
phenomena and the results of more detailed analysis of previously reported
effects.