A simply constructed extreme‐tilt holder for the Philips eucentric goniometer stage

SUMMARY A simple single‐tilt holder has been constructed for the eucentric goniometer stage of the Philips EM 400. This holder is also compatible with the EM 300 series stages. The main improvements are as follows: unlimited tilt range using ‘25°’ polepiece configuration; secure gripping of all types of specimen grids by an easily operated micro‐clamp; elimination of shading effects by the holder at high tilt angles; and reduction of potential sources of astigmatism at high tilt angles.