13
graphing interference figures it is necessary to swing in
the Bertrand lena in the magnification changer of the tube
adapter pol.
10,.
immersion
Switching the objective into the optical path:
Critically focus medium- or high-power dry objective onto
specimen, retain the focussed etote.
Place immersion objective between two detent positions of
the revolving nosepiece so as to point to the left or right
front, In this way, the specimen spot to be observed
becomes accessible.
Apply a drop of immersion oil to the specimen.
Switch immersion objective into working position.
Critically focus onto the image and observe it.
Removing the objective from the optical path:
Retain the focussed state of the specimen.
Swing out the objective in such a way that an adjacent
low-power objective engages into workinq position
(other�<�ise, there will be the danger of moistening the
front lens of objectives of short working distance with
oil).
Change specimen or remove oil or continue to work as
required.
11.
Condenser immersion
In order to take the high-power capability of the immer
sion objectives into account also on the illumination side,
especially for conoscopy, the
0.95
achromatic-aplanatic
condenser can be provided with an immersion head. It is
advisable to remove the stop screw from the underside
of the condenser changer when using the immersion condenser.
Then the condenser con be swung to the left out of its
engaged position so ttlat it is beside the microscope
stage at a distance that allows to screw off the
0.95
