A Removable Intermediate Lens for Extending the Magnification Range of an Electron Microscope

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Abstract
A removable intermediate lens is described which extends the range of magnification of a conventional instrument to 25:1 without sacrificing the accessibility of the objective and projection lens polepieces. The distortion, sensitivity to changes in accelerating potential and reproducibility of calibration are studied and found to be equal to, or better than in the standard arrangement. The system provides two values of the magnification which are essentially independent of the accelerating potential.

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