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Leica MZ16 F – Functions 19
5.1.1 Observation without fluorescence
The FLUOIII
®
filter system includes a UV shutter
that can be used to close the illumination beam
path. This feature protects the mercury lamp,
which should not be switched on and off too fre-
quently. If, for instance, you need to interrupt your
work, you do not have to switch off the high-pres-
sure mercury burner to preserve sensitive speci-
mens from being burned out or bleached out.
Switching the high-pressure mercury burner on
and off frequently decreases its life and causes
delays, as the lamp can only be switched back on
after it has cooled. Instead, you can close the
UV shutter and reopen it when you return to your
workplace.
Close the UV shutter:
– if you do not want to view the specimen with
fluorescence illumination, but with transmitted
light only.
– if you are taking a short break from work.
̈ Close the illumination beam path using the
switch (7.1).
Fig. 7
1 On/off switch for UV shutter
Fig. 8
1 Double iris diaphragm
1
1
5.1.2 Double iris diaphragm
You can use the built-in double iris diaphragm to
adjust the depth of field individually. When doing
so, however, note that when you increase the
depth of field,
– the brightness decreases, and therefore the
exposure times for photography increase,
– the resolution decreases.
̈ Adjust the double iris diaphragm as necessary
using the knurled ring (8.1).