Checking Phase Contrast Rings - Leica DM2700 M Instructions Manual

7. Startup

7.3 Checking Phase Contrast Rings

If your microscope is equipped for the use of
phase contrast, the light rings that fi t the objec-
tives are built into the condenser.
The light rings are already centered in the facto-
ry. 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).
Fig. 31 Focusing telescope
1 Adjustable eye lens
2 Clamping ring for fi xing the focus position
38
• In the place of an eyepiece, insert the focusing
• Swivel in the phase contrast objective with the
• Focus on the specimen with the focus wheel.
• Focus the ring structure (32.a) by slightly loos-
• Retighten the clamping ring.
• Select the corresponding ring diaphragm (light
• If the light ring and the phase ring are not
Fig. 32
PH=phase contrast ring, LR=light ring
a Condenser in brightfi eld (BF) position
b Condenser in phase contrast (PH) position,
c Light ring and phase ring centered
1
2
telescope (Fig. 31) into the observation tube.
lowest magnifi cation.
ening the clamping ring (31.2) and moving the
eye lens (31.1).
ring) in the condenser.
shown as arranged in Fig. 32c, the light ring
must be centered.
Phase Contrast Centering Procedure
Light ring (LR) not centered
a b
PH
c
LR