KERN OLM 171, User Instructions

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17 OLM-1-BA-e-1610
5.5 Adjusting the magnification
After prefocussing has been carried out using the objective with the lowest
magnification
(see section 5.2) you can then adjust the overall magnification using
the nosepiece, as necessary. By turning the nosepiece you can bring any one of the
four other objectives into the beam path.
When adjusting the nosepiece, you must take the following points into account:
- The required objective must be properly locked in place at all times.
- The nosepiece should not be rotated by holding individual objectives. You should
use the black ring below the objectives.
- When rotating the nosepiece you must always make sure that the objective which
is about to be positioned in the beam path does not touch the stage plate. This
can lead to significant damage to the objective lens.
We recommend that you always check from the side to make sure that there is
sufficient leeway. If this should not be the case, the nosepiece must be lowered
accordingly.
If you have focussed the object to be observed for a specific magnification, then if
you select the objective with the next greatest magnification, the object will be slightly
out of focus. Use the fine adjustment knob to make a slight adjustment and restore
the focus.