Leica DM R Serie Mode D'emploi page 72

out/in
Objective magnification
< 10x
≥ 10x
For brightfield observation the condenser top
can also be swung out for 10x objectives.
However, DF, PH and ICT would not work with
the condenser top swung out.
When the condenser top is swung out, the UCR,
UCPR and UCE condensers remain in the same
vertical position as when the condenser top is
swung in. When the condenser top on the UCE
condenser is swung out, the field diaphragm
takes over the job of the (variable) aperture
diaphragm. However, the "aperture diaphragm"
must be fully opened with low magnifications
and the UCE condenser. There is no exact
setting of the illuminated field.
With the UCR and UCPR condenser the field and
aperture diaphragm functions are retained
when the condenser top is swung out (Koehler
illumination).
0.50 S 15:
The Condenser top 0.50 S 15 is used from objective
magnification 5x. It has an intercept distance of
15 mm when there is no glass, etc. in the light
path between the condenser and the specimen.
The intercept distance is lengthened when plane-
parallel glass windows or liquids are introduced
into the light path by about a third of the
thickness of the glass or liquid, e.g. for a 3 mm
glass window the intercept distance is about
16 mm.
72
Condensor top S 1
swung out
swung in
P 1.40 OIL S 1
The Condenser top P 1.40 OIL S 1 is used when
maximum resolution is required with immersion
objectives with an aperture > 1.0, or for polariza-
tion-optic conoscopy (page 82) of large shaft
angles. About drop of Leica immersion oil is
applied to the front lens of the condenser, taking
care to avoid air bubbles. The groove round the
mount can pick up any superfluous oil.
The oil condenser top and condenser top
0.50 S 15 are not intended for phase contrast and
ICT interference contrast.
Diffusing screen, collector
Image homogeneity can be optimized by
adjusting the collector (48.19) and maybe
engaging 1 – 2 diffusing screen(s) (Fig. 9 and 11).
Possible errors
Wrong coverglass thickness (see page 47) or
wrong objective. Specimen has been placed on
the stage with the coverglass downwards
instead of upwards.
Aperture diaphragm (48.21) too wide or too
narrow. Incorrect height or centration of
condenser.
Lamp not adjusted (page 68). Dirty optics.