D1 series
3-8
View field diaphragm
（
Figure 19
）
The view field diaphragm can prevent the light
diameter into condenser in order to remove
varied-light and strength the image. When the image
of view field diaphragm is just outside of view field,
the objectives can provide optimal performance to
get the clearest image.
3-9
Aperture diaphragm (Figure 20&21)
1. Aperture diaphragm determines aperture number
of illumination. Only when the aperture number
for illumination and objective is matching, you
can get the better resolution and contrast of image
and to increase depth of field.
2. As the contrast of sample for microscope is very
low, please turn the knob during operation to let
the arrowhead point to number chip which shows
same magnification as objectives. That means
adjust the aperture diaphragm of condenser to
70-80% of objective aperture. If necessary, take
off the eyepiece and observe through eyepiece
tube and adjust knob till finding the image
Figure 18. (Figure 20&21) ( shows aperture
diaphragm and shows objective edge in Figure
20 )
9
Figure 20
Figure 21
Figure 19
