[3dem] Objective Astigmatism Stability

[Farzad]

Dear All,

Anybody has any experience in measuring the stability of objective
astigmatism in FEI F20 FEG columns (Tecnai, Talos or Glacios)? How much let
say "astigmatism drift" is normal if we do not change anything and come
back to the instrument after 15 minutes. I mean just imagin after
correcting it on a carbon film area and check it on a same region and same
optical set-up after a certain time?

the sample is normal carbon grid, no magnetic or loos particles there, and
also there is no major sample drift.

Regards

Farzad
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