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OBN-14-BA-e-1510
6. Use the aperture diaphragm of the condenser to find the
very best compromise between contrast and resolution for
the microscopic image. The scale divisions on the
condenser can be used as a guideline. Select in
accordance with the objective being used.
The view in the tube without the eyepiece should look
something like the illustration on the right.
The diameter of the aperture diaphragm which is then
visible should make up approximately 2/3 of the pupil
diameter.
If the eyepiece should be removed, for checking, then please make sure that no
dirt or dust falls into the tube.
7. It is possible to alter the brightness of the bulb using the
dimmer
. The brightness
is always controlled by the bulb brightness and not by the aperture diaphragm.
8. Possibly there is the need of re-adjusting the focus and x-y axis.
9. Observe the object.
If another magnification is selected afterwards, then the Koehler illumination does not
have to be reset from scratch, only the aperture diaphragm and field diaphragm need
to be adjusted as required.
As a result you can always check whether the condenser needs to be re-centred.
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