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Glossary terms about Magnification

Magnification
The enlargement of an image, or portion of an image.

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19 pages mention Magnification

Background information - What is scanning electron microscopy?
The scanning electron microscope (SEM) provides the competent user with an advantage over the light microscope (LM) in three key areas: Resolution at high magnification
Beam Adjustment
Choose a low magnification to start with and ensure your contrast and brightness are adjusted so you can see an image. 
Electromagnetic lenses, apertures and beam size
This helical path can easily be demonstrated at low magnification by changing the focus up and down to cause image rotation. 
Generating an image
The following image is from the secondary electron detector and shows a metal surface at the same magnification but with different beam energies (different kVs): 5kV; 10kV; 15kV; 30kV (across 1-4). 
Image Capture
You will need to set the information up that you want at the bottom of your photograph, such as magnification or a scale bar. 
Layout
Increased magnification is produced by decreasing the size of the area scanned. 
Magnification
magnification is the enlargement of an image, or portion of an image. 
Operation unit
Data such as accelerating voltage and magnification will be visible when the image in freeze mode. 
Principles of SEM operation
Layout  
Resolution
The concepts of resolution and magnification are often confused. 
Sample preparation
 
Saturating the filament
These advantages make the FEG SEM a high resolution machine for high magnification work. 
Spot size
At low magnifications we use a larger spot size than at higher magnifications. 
Troubleshooting: edge effect, charging, sample damage
One way to work around this artefact is to take micrographs at low magnification, before moving to higher magnification
Virtual SEM - bone
Shows the affect of such settings as accelerating voltage, spot size, Z-depth, filament current, magnification, and astigmatism. 
Virtual SEM - rock
Shows the affect of such settings as accelerating voltage, spot size, Z-depth, filament current, magnification, and astigmatism. 
Virtual SEM - slag
Shows the affect of such settings as accelerating voltage, spot size, Z-depth, filament current, magnification, and astigmatism. 
Virtual SEM - sparkler
Shows the affect of such settings as accelerating voltage, spot size, Z-depth, filament current, magnification, and astigmatism. 
What is astigmatism?
An image is generally regarded as free of astigmatism when it does not streak in one direction or the other when the objective lens is adjusted to under or over focus at around 10,000X magnification