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9. Contrast Methods
Special darkfield condensers are available for
the DM2000, DM2500 and DM3000 (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
Max. Objective Aperture
D 0.80 - 0.95
0.75
D 1.20 - 1.44 OIL
1.10
9.1.4 Oblique Illumination
• First adjust transmitted light darkfield.
• To obtain a relief-like contrast:
Condenser UCA/P:
Rotate condenser disk slightly out of the DF
position.
Condensers
CL/PH,
ACHR.0.9 (P):
Push DF slide in part way out of the DF posi-
tion.
Fig. 61
Darkfield condensers
1
Upper part (dry)
2
Lower part
3
Orientation pin
4
Upper part (oil immersion)
1
2
3
58
9.1.5 Polarization
• Swing the lambda plate of the lambda plate
• Insert a specimen and rotate an appropriate
• Bring the image into focus and set the Köhler
• Insert the analyzer as far as the clickstop into
• Push the polarizer with the labelled side fac-
CLP/PH
und
APL.
Fig. 62
1
2
4
compensator out if necessary.
objective into place.
illumination (→ p. 31).
the left side of the stand (fig. 64). The engrav-
ing λ must be on the underside of the stand.
When using the Pol intermediate tube*:
Switch on the analyzer.
ing upward into the lower opening.
Analyzer/polarizer
Analyzer slot
Polarizer mount
a
b
1
2
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