Transmission electron microscope and method of observing TEM images

A transmission electron microscope comprising:

• an electron beam source emitting an electron beam;
• an illumination lens for directing the electron beam emitted from the electron beam source at a sample;
• a first objective lens having an upper polepiece and a lower polepiece, wherein said sample is placed between the upper polepiece and the lower polepiece;
• a second objective lens disposed behind the first objective lens;
• a selected area aperture disposed at a first plane and limiting passage of the electron beam transmitted through the sample;
• a projector lens for bringing the TEM image of the sample formed by the first objective lens or the second objective lens into focus at a second plane;
• a detector having a light-sensitive portion disposed at the second plane and detecting the TEM image of the sample;
• and
• a control portion for controlling at least the illumination lens, the second objective lens, and the projector lens,
• wherein said first plane is located between said second objective lens and said projector lens, and
• wherein said control portion performs first sets of processing for controlling the illumination lens such that the electron beam hits the sample, controlling the second objective lens such that a diffraction pattern of the sample is imaged onto the first plane, and controlling the projector lens such that the TEM image of the sample focused by the second object lens is focused onto the second plane.