11
The field diaphragm is necessary to improve the
contrast (by reducing the scattered light on the
object layer). The biggest effect is visible at the
border of the field diaphragm. In case the
illumination aperture is to high, there is too much
scattered light in the object field and the pictures
have a low contrast. The field diaphragm is also
necessary for focusing at incident light
illumination.
The resolution capability, the contrast and the
depth of field can be also optimised by the
aperture diaphragm.
pic.3: overview – incident light tube
1 3W-LED
illumination
2
Filter holder (opened)
3
Adjusting ring for the aperture stop
(aperture diaphragm)
4
Adjusting ring for the illuminated field
aperture (field diaphragm)
5
Intermediate tube (RMA 5
∞
)
2.4 Polarization units
2.4.1
Incident light polarization
pic.4: overview – incident light tube
1 analyzer
slide
2
slide for compensator
3
slide for incident light
4
locking screw for analyzer
5 polarizer
slide
6
incident light unit (pic. 3)
To active the incident light push the switch on the
left side of the stand and the slide for incident
light (3). The polarizer slide (5) is on the right
side of the tube. The 180° rotatable analyzer
slide (1) is can be clamped by the locking screw
(4). The incident light tube is the same as for the
RMA 5
∞
.(pic.3)
