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OPERATION
Image of Aperture Diaphragm
Inside
Track
Edge of
Objective
Fig. 28
Fig. 29
Fig. 30
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UNITRON
(continued)
70-80%
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EXAMET-5 SERIES MICROSCOPE
Adjusting the Aperture Diaphragm
Transmitted Illumination
The aperture diaphragm ① decides the numerical aperture
of the illumination system. If the N.A. of the illumination
matches the N.A. of the objective ② , you'll achieve better
resolution and contrast and increase the depth of field.
As the contrast is usually low, adjust the condenser aperture
diaphragm to 70-80% of the objective N.A. being used. If
necessary, remove the eyepiece to observe through the
eyepiece tube. Adjust the aperture diaphragm adjustment
ring ② (Fig. 25) to adjust proportion until you see the image
(Fig. 28).
Use of graduation: set the N.A. of the condenser to 80% of
the N.A. of objective (Fig. 28).
Using the (Optional) Color Filters (Fig. 29)
Transmitted Illumination
A color filter can make the background more suitable and
increase the image contrast.
To insert a filter, place it as shown in Fig. 30 with the rough
side down.
When not using a color filter, insert the blank filter into the
filter slot.
(Fig. 25, 28-29)
17
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