image wobbler
image wobbler
A function to perform focusing of the illumination beam by the use of deflection coils below the condenser lens. The electron beam is repeatedly tilted at slightly positive and negative directions with respect to the optical axis. The excitation of the objective lens or the specimen position is adjusted so that the image does not move while the "image wobbler" is operated. The image wobbler is useful for rough focusing at magnifications up to ～50,000×.
Term(s) with "image wobbler" in the description
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