KERN OPTICS OKO 178, Руководство по эксплуатации

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17 OKO-1-BA-en-2111
5.5 Setting the magnification
After pre-focusing using the objective with the lowest magnification ( see section 5.2 ),
the total magnification can now be adjusted as required using the revolving nosepiece.
By rotating the revolver, any of the four other objectives can be brought into the beam
path.
It is essential to observe the following points when adjusting the revolving nosepiece:
- The desired lens must always be properly
engaged.
- The turret should not be rotated by holding it by
the individual lenses, but by the silver ring above
the lenses (
see illustration
).
- When rotating the turret, always make sure that the objective lens that is being
brought into the beam path does not come into contact with the specimen slide.
This can cause considerable damage to the objective lens.
It is best to always check from the side whether there is sufficient clearance. If this
is not the case, the object table must be lowered accordingly.
If you have focused the object of observation for a certain magnification, the focus can
easily get out of focus when selecting the objective with the next higher magnification.
In this case, the focus must be restored by slightly adjusting the fine adjustment knob.