Leica DM2500, Руководство пользователя

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58
9. Contrast Methods
a b
Fig. 62 Analyzer/polarizer
1 Analyzer slot
2 Polarizer mount
1
2
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, CLP/PH und APL.
ACHR.0.9 (P):
Push
DF slide in part way out of the DF posi-
tion.
9.1.5 Polarization
• 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 (
→
p. 31).
• Insert the analyzer as far as the clickstop into
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.
• Push the polarizer with the labelled side fac-
ing upward into the lower opening.
Fig. 61 Darkfield condensers
1 Upper part (dry)
2 Lower part
3 Orientation pin
4 Upper part (oil immersion)
1
2
3
4