Leica DMI3000B Bedienungsanleitung Seite 77

Integrated phase contrast with bright fi eld
objectives via front slider
When choosing an objective suitable for phase
contrast, the appropriate light ring is selected
automatically when using a motorized condens-
er. Otherwise, select the light ring manually.
Centering the phase rings is not required for ob-
jectives with eyepoint A. Checking the position
of the phase rings is essential only when using
objectives with eyepoint C.
(For the eyepoint of your objective, please refer
to the included objective list or the engraving on
the objective itself.)
• Move the front slider with the phase rings into
the beam path.
Leica DMI3000 B:
• If necessary, adjust the TL bright fi eld position
at the fi lter slider.
• Set the condenser to the bright fi eld position.
Leica DMI4000 B and Leica DMI6000 B:
• Press the BF (bright fi eld) button (one of the
variable function buttons on the stand).
• Select the objective with the lowest magnifi -
cation.
• Focus on the specimen.
• Select the objective with the lowest magnifi ca-
tion and eyepoint C.
Leica DMI3000 B:
• Select the light ring for your current objective
on the condenser.
Leica DMI4000 B and Leica DMI6000 B:
• Press the PH (phase contrast) button (one of
the variable function buttons behind the focus
wheels). The light ring will be selected in the
condenser.
• Slide the front slider with the phase rings to
position C (A and C refer to the eyepoint of the
objective. For the eyepoint of your objective,
please refer to the included objective list or the
engraving on the objective itself.)
• Instead of an eyepiece, place a focusing tel-
escope (Fig. 93) in the observation tube or acti-
vate the Bertrand lens (pull rod (94.1) on tube).
• Focus the ring structure (95a) by loosening
the clamping ring (93.2) somewhat and moving
the eyelens (93.1), or focus the Bertrand lens
(94.2).
• Retighten the clamping ring.
• If the light ring and the phase ring are not
shown as arranged in Fig. 95c, the light ring
must be centered.
• Insert the centering key in the opening provid-
ed on the front slider
• Turn the centering keys until the dark ring
(phase ring in the objective) is congruent with
the slightly narrower bright ring (light ring in
condenser) (95 c).
• Remove the centering keys after centering.
7. Start-up
77