Chapter 3 Operation Procedures
14
Operation of the Aperture Diaphragm
The aperture diaphragm open/close dial is located on the front
of the zoom body.
The aperture diaphragm controls the numerical aperture of the
illumination system, closely related to the optical image
brightness, contrast, resolution, and depth of focus.
The aperture diaphragm of the zoom body is adjusted with the
aperture diaphragm open/close dial and the image changes in
response to the adjustment as below.
Aperture diaphragm Close ⇔ Open
Brightness Dark Bright
Depth of focus Great Shallow
The more the aperture diaphragm is closed, the greater the
depth of focus becomes, but the resolution deteriorates.
Under a low magnification, effect of the aperture diaphragm
operation is smaller.
Aperture diaphragm
open/close dial
Aperture diaphragm operation
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