Leica DM R Serie Mode D'emploi page 24

Light rings* and discs*
Remove the disc from the condenser after
loosening the clamp screw (14.4). Take off the
cover plate (17.1) after unscrewing the 4 fixing
screws. For 8-position disc only: Also take off
the second cover plate (17.2) after unscrewing
the 3 fixing screws.
Insert the light rings for phase contrast (17.8,
identified by the code nos. 1, 2, 3 and the
intercept distance S of the corresponding
condenser top, e.g. 2 S 1) into the small holes
(Fig. 15/PH) of turret as follows:
Unscrew both centering screws (15.X) slightly
with the supplied Allen key (15.3) so that the
light rings can be inserted.
When the light rings are inserted, their labels
must be visible, i.e. pointing upwards.
Keep to the order 1, 2, 3. Insert the large light
ring for darkfield DF into the large hole (15.D,
with centering facility). The darkfield ring can
only be inserted into 2 of the 4 large holes on
the 8-position turret.
Using the Allen key, readjust the centering
screws until they do not protrude outside the
outer edge of the disc and the light rings
cannot fall out.
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Fit ICT condenser prisms if used (see below).
For 8-position turret only: Lay the cover plate
(17.2) on the disc so that all drill holes
coincide and fix with the 3 screws. Push the
plastic labels (17.3) into the cover plate as
follows:
On the side opposite to the axis of rotation,
corresponding to the light ring, i.e.
O for darkfield,
ring 2 S 1,
D
So that the lettering is not upside down when
read, i.e. reading in a direction away from the
outer edge of the turret.
Label unoccupied positions with blank white
plates if desired.
Screw the upper cover plate back on with the
4 screws and fix the disc back onto the con-
denser (14.4). Make sure that the disc can be
rotated by 360°.
λ- and λ/4-compensator
Model for 8-position condenser disc (17.6):
Insert so that the notch engages in the spring
fin; fix with an Allen key (15.3).
O for light
2
O for brightfield, etc.
H