Leica DM5500 B Manuel D'utilisation page 53

• Focus the ring structure (50a) by slightly loos-
ening the clamping ring (49.2) and moving the
eyelens (49.1).
• Retighten the clamping ring.
• Press the PH (Phase Contrast) button (one of
the variable function keys at the stand or at
the LeicaScreen). The ring diaphragm in the
condenser is pivoted in.
• If the light ring and the phase ring are not
shown as arranged in Fig. 50c, the light ring
must be centered.
• Insert the centering key through the corre-
sponding openings (51.1) in the condenser
holder.
Fig. 50 Phase contrast centering procedure
PH=phase contrast ring, LR=light ring
a Condenser in bright field (BF) position
b Condenser in phase contrast (PH) position
Light ring (LR) not centered
c Light ring and phase ring centered
a b c
• Turn the centering screws until the dark ring
(phase ring in the objective) is congruent with
the slightly narrower bright ring (light ring in
condenser) (50 c).
Caution!
During change of objectives the centering
keys must not remain in the openings of the
condenser. They can block the condenser.
• Repeat the process for all other phase con-
trast objectives.
• Remove the centering keys after the centering
procedure.
Fig. 51 Light ring centering
1 Centering key
2 Opening for centering of motorized polarizer
1
7. Startup
2
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