33
7. Start-up
7.3 Checking Phase Contrast Rings
If your microscope is equipped for the use of
phase contrast, the light rings that fit the objec-
tives are built into the condenser.
The light rings are already centered in the
factory. However, the centering should be
rechecked.
Note:
A light ring slide which is inserted into the side
of the condenser is used for condensers without
condenser disks. Centering is not required in
this case.
Note:
When swiveling in a suitable objective for
phase contrast, the corresponding light ring
must be chosen.
The objective engraving (e.g. PH 1) indicates the
corresponding light ring (e.g. 1).
• In the place of an eyepiece, insert the focus-
ing telescope (Fig. 36) into the observation
tube.
•Swivel in the phase contrast objective with
the lowest magnification.
• Focus on the specimen with the focus wheel.
• Focus the ring structure (37.a) by slightly loos-
ening the clamping ring (36.2) and moving the
eye lens (36.1).
• Retighten the clamping ring.
• Select the corresponding ring diaphragm
(light ring) in the condenser.
• If the light ring and the phase ring are not
shown as arranged in Fig. 37.c, the light ring
must be centered.
Fig. 36 Focusing Telescope
1 Adjustable eye lens
2 Clamping ring for fixing the focus position
1
2
PH LR
Fig. 37 Phase Contrast Centering Procedure
PH=phase contrast ring, LR=light ring
a Condenser in brightfield (BF) position
b Condenser in phase contrast (PH) position
Light ring (LR) not centered
c Light ring and phase ring centered
ab c
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