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OPERATION
Axio Imager
Illumination and contrast methods
Carl Zeiss
M70-2-0020 e 06/2009
430000-7344-001
165
(3)
Setting the microscope for conoscopy
with the phototube Pol
In the case of uniaxial crystals, the most favorable
orientation for conoscopic viewing is obtained with
those specimen features (e.g. of a thin section)
that in orthoscopic viewing change the brightness
as little as possible. In this case, the direction of
viewing and the optical axis are
±
parallel. The same
refers also to biaxial crystals, if they are viewed
along or approximately in the direction of one of
the two optical axes.
•
Set the microscope as for transmitted-light
polarization (see Section 4.9.5.1 (3)).
•
Put the specimen onto the stage and focus on
it.
•
Switch phototube Pol to visual observation, if
necessary. To this end, pull out the push-pull
rod on the left side (4-126/
3
).
•
On phototube Pol, push in the front push-pull
rod (4-126/
2
) on the right side to move the
reticle into the light path.
•
Move a selected crystal to the center of the
reticle.
•
Swivel in the 40x, 50x or 100x objective and, if
necessary, refocus the specimen using the
focusing drive.
•
Check the centering of the objective by rotating the microscope stage. Recenter it, if necessary.
•
Turn the front push-pull rod (4-126/
2
) to close the luminous-field stop so far that only the selected
specimen feature remains visible. This is to prevent that the axial figure of the crystal to be examined is
not overlapped by axial figures of adjacent crystals. This way, it is possible to view specimen features
of up to 10 µm diameter in conoscopic illumination.
•
Move the Bertrand lens on the phototube Pol into the light path. To this end, push in the rear push-
pull rod (4-126/
1
) on the right side. On doing so, the axial figure appears in the field of view. To focus
the axial figure, turn this push-pull rod.
(4)
Setting the microscope with Bertrand lens slider or tube lens turret with Bertrand lens
optics for conoscopy of large-size specimens
•
Set the microscope as for transmitted-light polarization (see Section 4.9.5.1 (3)).
•
Put the specimen onto the stage and focus on it.
•
Swivel in the 40x, 50x or 100x objective and, if necessary, refocus the specimen using the focusing
drive.
•
Check the centering of the objective by rotating the microscope stage. Recenter it, if necessary.
•
Close the luminous-field diaphragm so far that only the selected specimen feature remains visible.
Fig. 4-126 Axio Imager mit montiertem
Fototubus Pol