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Glossary terms about Axial Resolution

Axial Resolution
Resolution (or resolving power) of a microscope objective measured in the axial (z) direction. This is sometimes referred to as the depth of field

2 pages mention Axial Resolution

Collecting Z stacks
With the insertion of a pinhole we are now able to optically section the sample. 
Confocal microscopy
The axial (Z) resolution is always worse, and unlike the lateral resolution (which relates directly to the NA) the axial resolution depends on the square of the NA.