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Assembly of field diaphragm
To enable Koehler illumination when using
condensers 0.53 S23 and 0.90 S1, a field
diaphragm has to be assembled. Insert the field
diaphragm module (18.1) into the mount (Fig. 18)
from below. The diaphragm adjustment (18.2)
should point in the direction of the tube. Secure
with clamp screw (18.3).
Assembly of filters and filter holder
The Leica DM IRB is equipped with a holder with
spaces for 3 filters with 40 mm diameter.
The filters are already fitted into the holder at
the factory. If you are retrofitting filters yourself,
assemble as follows:
● Slacken the clamp screws (Fig. 19.1) and
remove the filter holder.
● Put the filters into the holder (20).
● Mount the filter holder onto the transmitted
light illumination column and secure in posi-
tion with the clamp screws.
Fig. 18␣ ␣ Assembly of field diaphragm
1 Field diaphragm module, 2 Field diaphragm adjustment,
3 Clamp screw for securing the field diaphragm module
Fig. 19 Assembly of filters
1 Clamp screw for securing the filter holder
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Fig. 20 Assembly of filter holder for 3 filters