28
4-6 Condenser
1
2
a
5
7
6
8
3
7
8
b
With the Condenser (IX3-LWUCDA, IX2-
LWUCD, IX-ULWCD or IX2-MLWCD)
Rotate the turret (either manually or electrically) to select the “BF”
brightfield observation (with which no optical element is engaged in
the light path).
Move the aperture iris diaphragm lever to open the diaphragm.
Move the field iris diaphragm lever
a
to the fully open position
( ).
Engage the 10X objective and bring the specimen into focus.
Using the field iris diaphragm lever
a
, stop down the field iris
diaphragm until its image is just inside the field of view.
Rotate the condenser height adjustment knob to bring the field iris
diaphragm image into focus.
While gradually opening the field iris diaphragm lever
a
, install
the Allen screwdriver provided with the microscope in the adjust-
ment hole
b
and rotate it so that the field iris diaphragm image is
centered in the field of view of the eyepieces.
To check centration, open the field iris diaphragm lever
a
until its
image inscribes the field of view. Now the condenser is centered.
In actual observation, open the field iris diaphragm until its image
circumscribes the field of view.
Effect of Field Iris Diaphragm
This is the iris diaphragm to adjust the area to be illuminated. By
narrowing down to the level circumscribing the field of view depend-
ing on objectives, the excess light can be shielded to acquire the
image with good contrast.
} Depending on the condenser to be used, the field iris diaphragm
may not be viewed by the objective of 40X or higher magnification.
1
2
3
4
5
6
7
8
1
Centering the Condenser
Both the right and left
side of the condenser
