Oblique Illumination (Tl); Polarization (Tl) - Leica DM2700 M Instructions Manual

9. Contrast Methods
Special darkfi eld condensers are available for
the Leica DM2700 M (Fig. 61).
The application potential of the DF condensers
depends on the aperture of the objective in use.
For objectives with a built-in iris diaphragm, the
aperture can be adapted..
DF condenser
D 0.80 - 0.95
D 1.20 - 1.44 OIL

9.2.4 Oblique Illumination (TL)

• First adjust transmitted light darkfi eld.
• To obtain a relief-like contrast:
Condenser UCA/P:
Rotate condenser disk slightly out of the DF po-
sition.
Condensers CL/PH, CLP/PH and
APL. ACHR.0.9 (P):
Push DF light ring slide part way in.
Fig. 61 Darkfi eld condensers
1 Upper part (dry)
2 Lower part
3 Orientation pin
4 Upper part (oil immersion)
1
2
3
60
max. objective aperture
0.75
1.10
4

9.2.5 Polarization (TL)

• Swing the lambda plate of the lambda plate
compensator out if necessary.
• Insert a specimen and rotate an appropriate
objective into place.
• Bring the image into focus and set the Köhler
illumination.
• Insert the analyzer as far as the click stop into
the left side of the stand (Fig. 62). The engrav-
ing λ must be on the underside of the stand.
When using the Pol intermediate tube*:
Switch on the analyzer.
• Push the polarizer with the labeled side facing
upward into the lower opening.
Fig. 62 Polarization
1 Analyzer
2 Polarizer
1
2