18
4. Video Attachment
3.2.7 Adjustment of Field Stop
（
Fig.22
）
Turn the field stop ring
③
in the direction
shown in the figure to close the filed stop.
Turn the field stop ring in the opposite
direction to increase the filed stop. According
to the magnification of the objective, adjust
the filed stop until filed stop is
circumscribed with filed which will reduce the
mixed light and improve the quality of the
image.
3.2.8 Condenser Adjustment
（
Fig.23-24
）
Turn the condenser focus knob
①
to move
the condenser up and down. Raise the
condenser
when
using
the
high
magnification objective, and descend it
when using the low magnification one.
Centering the Condenser:
1. Adjust the condenser focus knob
①
to the
highest position.
2. Focus the specimen with 10× objective.
3. Rotate field stop ring
②
until the image of
field stop can be observed.
4. Adjust the condenser focusing knob
①
to
focus the image of field stop.
5. Rotate the centering screw
③
by Allen wrench
to center the field stop.
6. Gradually open the field stop until the image
of the field stop inscribed with the field of
viewing. That means the condenser is
centered correctly.
7. Slightly increase the field stop in reality
operation to make the image circumscribed
with the field.
Fig.23
Fig.24
③
④
①
③
Fig.22
②
