15
STEINDORFF
®
Fig. 32
Fig. 33
3.14.
Adjusting the Swing out Condenser (Fig. 32)
The center of the condenser and the light axes of the objective are
coaxial. It has been adjusted before leaving factory, so the user
needn’t to adjust them by self.
The highest position of the condenser has been adjusted too. It also
needn’t any user’s operation. Turn the condenser focus knob to shift
the condenser. It needs to raise the condenser when using the high
magnification objective, and to decline when using the low
magnification one.
1.
Using the Swing out Condenser
When using the low magnification objective, turn out the
condenser, and let it away from the light path. While using
the high magnification objective, turn it into the light path.
2.
Adjusting the Aperture Diaphragm
The aperture diaphragm is designed for the adjustment of the
numerical aperture, not for the brightness. Generally,
reducing the diaphragm opening to 70- 80% of the N.A.
value of the respective objective will provide an image of
acceptable quality. If you want to observe the image of the
aperture diaphragm, remove one eyepiece and look through
the tube. You will see a dark circle encroaching on the
bottom of the tube.
3.15.
Adjusting the Field Diaphragm (Fig. 33)
The control for the field diaphragm is a ring used for adjusting the
area of field diaphragm. When using, turn the ring to reduce the field
diaphragm, look into the field, if the diaphragm image is faintness, do
the follow steps: first, turn the condenser focus knob, shift the
condenser holder to the position where the observed image of the field
of view is sharp; then open the field diaphragm, let the image full of
the field of view, reduce the mixed light, improving the quality of the
image.
