90
Attention:
Never look into the direct light path! There is
danger of glare when switching to the
brightfield reflector (BF) or the Smith
reflector (6.4; 6.5)!
Imaging the light sources to check adjustment
There are several different ways of imaging the
lamp filament or discharge arc; the field
diaphragm (63.6 or 65.8) is first narrowed and the
aperture diaphragm (65.12) opened. Switch to
the light source you want to use (61.7*).
Using the centering aid
To do this the left side of the microscope stand
must be equipped with the adjustment window
(61.9) for imaging the light source. Put the
centering aid (reflector for lamp adjustment,
18.2) into the reflector turret instead of a filter
cube or reflector (see page 26). Rotate the turret
until the centering aid is in the light path.
Alternatively:
Projection on the microscop e base
Remove the specimen and the condenser. Turn
in a 5x (or 2.5x) objective. Put a piece of blank
paper or card on the microscope base: the
bright circle projected onto it represents the
(unfocused) projection of the objective pupil (in
principle the condenser could be left on the
microscope and the adjustment carried out
through the condenser at a certain setting, but
this method is not recommended due to the
necessity for exact condenser adjustment).
Or:
Back reflection via the sp ecimen
Focus a well-reflecting incident light specimen
(e.g. surface mirror) (this is not possible for
fluorescence). Remove an eyepiece from the
tube, or engage Bertrand lens (50.2 or 54.2/11)
and focus, or use an auxiliary telescope (51.1).
The light source can be observed inside the
bright circle (objective pupil) through the tube.
Centration of reflected light lamps
Lamp housing 106 (Fig. 4, page 12) with 12 V 100 W
lamp
.
Adjust the collector (48.19) until you see the lamp
filament (Fig. 47, page 68).
Using a screwdriver (1.1) adjust the vertical
position (48.17) of the lamp holder until the
slightly brighter stripe in the reflection of the
lamp filament is in the centre of the brighter
area (Fig. 47). Then move the reflection of the
lamp filament with the horizontal adjustment
(48.18) to the centre of the range of movement
(Fig. 47).
Lamp housing 106 z with halogen lamp and gas
discharge lamp (Fig. 5, p age 13 and Fig. 61)
The image of the light source is focused with the
collector (61.6) and the holder with the light
source adjusted vertically and horizontally (61.1
and 61.2). The reflector is also focusable (61.4)
and centerable in x and y direction (61.3
and 61.5).
