Allows the magnification of the TEM to be adjusted to any of the listed values. The intensity of the electron beam is automatically adjusted to account for the change in magnification so as to maintain a consistent average illumination. Allows the intensity of the electron beam to be modified. The units are currently uncalibrated so it takes some trial and error to effect a reasonable change. Allows for some control over focus.
Manual focus allows free control of the focus to any selected value.
The current level of defocus can be measured using the button supplied. The autofocus option functions by first measuring the defocus and then changing it to the appropriate value. The size of movement can be selected ranging from a pixel to a full screen. The ITG is part of the Beckman Institute for Advanced Science and Technology at the University of Illinois . All rights reserved.