OPERATION
Axio Lab.A1
Lighting and contrasting method in transmitted light
Carl Zeiss
04/2013 430037-7144-001
97
1
Slide 6x20 with
O
/4 plate
2
Lower section of circular polarizer
3
Lever for rotating
O
/4 plate
4
O
/4 plate in upper part of the circular polarizer
5
Adjustment
slits
Fig. 4-16
Components for circular polarization contrast on conoscopy stand
x
An (anisotropic) specimen should not be observed until after the above adjustment.
x
Reinsert the specimen to be examined.
In their interference color – dependent on material, specimen thickness and orientation – the specimens
appear constant and independent of stage rotation.
For a high-contrast image with higher objective enlargements (from approx. 20x) the
illumination aperture must be reduced to a value between 0.15 and 0.20, i.e. the aperture
diaphragm must be closed accordingly.
The effect of the
O
/4 plate (Fig. 4-16/
4
) can be undone by either swiveling it out of the light
path or turning it with lever (Fig. 4-16/
3
) into one of its two click-stop positions.
