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Glossary terms about Depth of field

Depth of field
The vertical distance above and below a point on a sample that is being focussed that will also be in focus in an image.

7 pages mention Depth of field

Background information - What is scanning electron microscopy?
The best resolution possible in a LM is about 200 nm whereas a typical SEM has a resolution of better than 10 nm (typically 5 nm). depth of field i. 
Electromagnetic lenses, apertures and beam size
During an alignment procedure to produce a good image, the aperture needs to be checked that it is centred around the beam axis. 
Risk assessment example: transport and analysis of a SEM sample
Role of sample height
In many SEMs an external working distance (Z) control is used to either raise or lower the specimen. 
Sample preparation
Useful links
What is an SEM (Parts of the machine)?