59
9. Contrast Methods
9.2.2 Phase Contrast (TL)
• Insert a transmitted light specimen.
• Rotate an appropriate objective into place.
Objectives that are suitable for phase contrast
are engraved with
PH
.
• Bring the image into focus using the focus dial
and set the brightness.
• For an optimal fi eld diaphragm setting, check
the Köhler illumination (
→
p. 35).
• Open the aperture diaphragm completely (po-
sition
PH
).
• Condensers UCL/UCLP and UCA/P:
Set the light ring corresponding to the objec-
tive on the condenser nosepiece disk.
Example: Light ring
1
belongs to the objective
with the engraving PH
1
.
Condensers CL/PH, CLP/PH and
APL. ACHR.0.9 (P):
Use the light ring slide.
Note:
Condensers UCL/UCLP and UCA/P: Light rings
must be centered (
→
p. 38).
9.2.3 Dark Field (TL)
• Insert a transmitted light specimen.
• Rotate an appropriate objective into place.
• Bring the image into focus using the focus dial
and set the brightness.
• Condenser UCA/P and UCL:
Click the condenser disk into the
BF
position.
Condensers CL/PH, CLP/PH and
APL. ACHR.0.9 (P):
Pull out the
DF
light ring slide as far as the stop.
Check the Köhler illumination (
→
p. 35).
• Open the aperture diaphragm completely (po-
sition
PH
).
• Condenser UCA/P and UCL:
Click the condenser disk into the
DF
position.
Condensers CL/PH, CLP/PH and
APL. ACHR.0.9 (P):
Insert
the
DF
light ring slide as far as the stop.
Note:
Condensers UCL/UCLP and UCA/P: The DF light
ring must be centered (
→
p. 38).
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: ......