69
7. Start-up
7.7 Checking Phase Contrast Rings
If your microscope is equipped for phase con-
trast, light rings to match your objectives will be
installed in the condenser.
The light rings are already centered in the facto-
ry. However, the centering should be rechecked.
Note:
Each objective has its own light ring assigned to
it in the condenser. The test must therefore be
performed for each objective. When selecting
an objective suitable for phase contrast, the ap-
propriate light ring will automatically be select-
ed as well.
• Press the
BF
(brightfield) button (one of the
variable function buttons on the stand).
• Instead of an eyepiece, place a focusing
telescope (Fig. 93) in the observation tube or
activate the Bertrand lens (pull rod (94.1) on
tube).
PH
LR
Fig. 95
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
a
b
c
Fig. 93
Focusing telescope
1
Adjustable eyelens
2
Clamping ring for fixing the focus position
1
2
Fig. 94
1
Activating the Bertrand lens
2
Focusing the Bertrand lens
• Select the phase contrast objective with the
lowest magnification (one of the variable
function buttons on the SmartMove).
• Focus on the specimen using the SmartMove
or the focus wheels.
1
2
