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Bruker Optik GmbH HYPERION User Manual
Overview 3
3.7.4 Iris aperture for setting the Koehler illumination
In reflection mode
This aperture (E in fig. 3.10) is used for setting the Koehler illumination in reflection
mode. The illumination intensity can be set in a stepless manner.
In transmission mode
This aperture (B in fig. 3.10) is used for setting the Koehler illumination in transmission
mode. It is located underneath the microscope stage. This aperture is opened and
closed by rotating the knurled ring.
B
Lever in front position:
When the lever is in the front position, the aperture can be
rotated by max. 360° using the thumbwheels (A in fig. 3.11). In this case, the previ-
ously set aperture opening size is locked and the knife-edge aperture is rotated. The
rotation center is identical with the center of the viewing field.
C
Lever in back position:
When the lever is in the back position, the distance between
two opposite knife edges (i.e. the size of the
rectangular aperture opening
) can be
increased or reduced using the two thumbwheels (A in fig. 3.11). In doing so, the size
of the
rectangular aperture opening is set.
Fig. 3.11 Operating elements of the knife-edge aperture
Figure 3.12: Operating element of the aperture for setting Koehler illumination in reflection mode
Lever
Lever position Aperture setting
Lever is pushed in completely. Aperture is open.
Lever is pulled out completely. Aperture is closed.
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