Patent ID: 6878934

Claim:
A method of observing a specimen in a field of view of an electron microscope comprising the acts of: setting the magnification of said electron microscope; setting at least one condition for moving said field of view; setting a starting position for said field of view; moving said field of view based upon said at least one condition; illuminating said specimen with an electron beam having a first angle and forming a first transmission image of said specimen in said field of view; adjusting said electron beam to a second angle and forming a second transmission image of said specimen in said field of view; calculating a degree of coincidence between said first and second transmission images; determining whether an image of said field of view is suitable or not for an observation based on the calculated degrees; and moving the field of view to a next position when (1) the images of said field view is determined to be not suitable or (2) the image of said field of view is determined to be suitable and the observation of said image is finished.