38
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
).
• In the place of an eyepiece, insert the focusing
telescope (Fig. 31) into the observation tube.
• Swivel in the phase contrast objective with the
lowest magnifi cation.
• Focus on the specimen with the focus wheel.
• Focus the ring structure (32.a) by slightly loos-
ening the clamping ring (31.2) and moving the
eye lens (31.1).
• 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. 32c, the light ring
must be centered.
Fig. 31
Focusing telescope
1
Adjustable eye lens
2
Clamping ring for fi xing the focus position
1
2
PH
LR
Fig. 32
Phase Contrast Centering Procedure
PH=phase contrast ring, LR=light ring
a
Condenser in brightfi eld (BF) position
b
Condenser in phase contrast (PH) position,
Light ring (LR) not centered
c
Light ring and phase ring centered
a
b
c
Summary of Contents for DM2700 M
Page 1: ...Leica DM2700M Instructions Bedienungsanleitung ...
Page 3: ...Leica DM2700M Instructions ...
Page 18: ...18 4 Overview of the Instrument 410 496 330 115 Dimensions specification in mm ...
Page 79: ...Leica DM2700M Bedienungsanleitung ...
Page 94: ...18 4 Geräteübersicht Abmessungen Angabe in mm 410 496 330 115 ...
Page 155: ......