23
Fig. 30
4-6 Condenser
1
Centering the Condenser
(Figs. 30 & 31)
With the IX2-LWUCDA2/IX2-LWUCD Universal Condenser or IX-ULWCD
Condenser
1. Rotate the turret
1
(either manually or electrically) to select the “BF”
brightfield observation (with which no optical element is engaged in the
light path).
2. Move the aperture iris diaphragm lever
2
to open the diaphragm.
3. Move the field iris diaphragm lever
3
to the fully open position (
=
).
4. Engage the 10X objective and bring the specimen into focus.
5. Using the field iris diaphragm lever, stop down the field iris diaphragm
until its image is just inside the field of view.
6. Rotate the condenser height adjustment knob
4
to bring the field iris
diaphragm image into focus.
7. While gradually opening the field iris diaphragm, rotate the condenser
centering knobs
5
on the condenser holder to adjust so that the field iris
diaphragm image is centered in the field of view of the eyepieces.
8. To check centration, open the field iris diaphragm until its image inscribed
the field of view. Now the condenser is centered.
}In actual observation, open the field iris diaphragm until its image cir-
cumscribes the field of view.
# When the IX2-ULWCD condenser is combined with a 40X or higher-
power objective, the field iris diaphragm cannot be seen in the field
of view.
# When the IX2-LWUCDA2 or IX2-LWUCD condenser is combined with
a 100X objective, the field iris diaphragm cannot be seen in the field
of view.
1
4
2
3
5