Checking Phase Contrast Rings - Leica DM1000 Mode D'emploi

• Using the condenser height adjuster (25.1),
adjust the condenser until the edge of the
field diaphragm appears in sharp relief (26b)
• If the image does not appear in the middle of
the field of view (26c), the condenser must be
moved into the middle of the field of view with
the help of the two centering bolts (25.4); the
tool required for this purpose is magnetically
attached to the underside of the stage
• Open the field diaphragm just enough for it to
disappear from the field of view (26d)
Note:
The condenser height adjustment depends on
the thickness of the specimen. It may be
adjusted for different specimens.
Fig. 25
1 Condenser height adjuster
2 Brightness control
3 Field diaphragm
4 Condenser centering
1 2

7.3 Checking Phase Contrast Rings

If your microscope is equipped for the use of
phase contrast, the light rings that fit the objec-
tives are built into the condenser disk*.
The light rings are already centered in the
factory. However, the centering should be
rechecked.
A light ring slide which is inserted into the side
of the condenser is used for condensers without
condenser disks. Centering is not required in
this case.
When swivelling in a suitable objective for
phase contrast, the corresponding light ring
must be chosen.
The objective engraving (e.g. PH 1) indicates the
corresponding light ring (e.g. 1).
Fig. 26
a Field diaphragm not focused, not centered
b Field diaphragm focused, but not centered
c Field diaphragm focused and centered,
d Field diameter (light) = Field diameter (view)
4
3
Note:
Note:
Köhler illumination
diameter is too small, however
(Köhler illumination)
a
c
7. Start-up
b
d
29