Leica DMLB Bedienungsanleitung Seite 47

Polarizer: Attach filter holder (32.1) to the
condenser holder (33.4; 5.2), → p. 11. Push the
polarizer (33.5a/b) into the lower opening.
!
Attention:
Always use the polarizer with the labelled side
upwards, as otherwise the integrated heat
protection filter is ineffective and the special
polarizer will become useless (discolouring!).
Alternatively, use polarizer ICT/P* (32.2; 34.9).
Condenser: The standard condensers CL/PH and
UCL 0.90/1.25 OIL S1 are not suitable for
polarization, as there may be major lens strain.
The Pol condenser CLP/PH 0.85 S1 or UCLP 0.85
S1 is required. Apart from the engraving 0.85,
they look just like the standard condensers
(Fig. 7) or the UCA/P condenser (Figs. 10, 11, 12)
from the outside.
Crossing the polarizers
Remove the object or find an empty area of the
specimen. Push the analyser into the stand as
far as the 2nd clickstop (33.6 and 34.1), or switch
on the module (not illustrated). Turn the hinged
analyser outfit (not illustrated) into the marked
centre position. Remove compensators (33.4;
33.7; 33.8; 9.6; 11.10) from the light path.
Rotate the polarizer (33.5a or 34.8 and 34.9) until
you reach the maximum extinction position in
the eyepiece.
λ- and λ/4 compensator
To activate the compensator (λ = 1st order red =
gypsum plate = wave plate = sensitive tint or λ/4
= mica plate): push in the analyser (32.6) upside
down. Alternatives:
Insert the λ or λ/4 compensators (33.6b) above
the polarizer (33.6a) and rotate to the left,
roughly as far as the stop. The disc (9.6; 11.10)
can also be equipped with a whole- and quarter-
wave compensator, or 4 x 20 mm compensators
(32.7) can be pushed into the tube slit (33.8) or λ
compensator in slide for condenser CLP/PH.
Possible errors
Polarizers damaged (discoloured) by powerful
light sources or dirty.
Objectives or condenser strained through
mechanical damage or wrong condenser (CL/PH
and UCL cannot be used!)
Beamsplitter or filter or diffusing screen
between the polarizers.
Mounting medium or specimen slide or
coverglass birefringent.
Further sources of error → p. 42.
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