49
Fig. 49a IMC-Components (new)
1 IMC-Modulator, 2 IMC slit-diaphragm slide, 3 Allen key
,
4
Adjusting screw on the IMC slit-diaphragm slide
,
5 Ad-
justing screw on the IMC-Modulator-slide
Optimising the IMC (Fig. 49a):
When using the objective with the largest mag-
nification, it may not be possible to adjust the
light slit stop perfectly (in other words, the light
slit cannot be positioned completely on the grey
field, with the result that an offset is noticeable
in either the white or the dark area). In this case,
it is also possible to perform fine adjustments
using the adjusting screw on the IMC modulator
slide.
Use the Allen key to turn this screw to minimise
the offset (to superimpose the grey area and the
illumination slit). After that, swivel the 10x objec-
tive back in (followed by the other objectives)
and adjust at the modulator again as described
above. Repeating this operation several times
should mean that offset no longer occurs.
This adjustment generally need to be performed
only once.
Once the IMC is perfectly adjusted, remove the
focusing telescope and replace the eyepiece.
23
4
5
1
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