Leica DM R Serie Mode D'emploi page 47

Objectives/Assembly
For microscopes with fixed nosepiece: lower
stage as far as possible (42.12 or 44.3). If you
have a motor focus, press keys 44.5 and 44.6
simultaneously to display an already stored
magnification (page 64).
Microscopes with interchangeable nosepiece:
loosen the clamp screw on the left (48.5), pull
out the nosepiece towards the front and place
upside down on a clean flat surface.
Screw in the objectives carefully as far as
possible in order of ascending magnification,
corresponding to the order of the light rings (PH
1 – 3) or the IC prisms in the condenser.
Once you have assembled the objectives and
nosepiece, rotatable objective collars should be
turned so that you can easily read the lettering.
Fig. 40 Examples of objectives
1 Brightfield objective, 2, 3 POL objectives, 4 Phase contrast immersion objective, 5 Immersion objective with iris diaphragm,
6 CORR objective for inverted microscopes, 7 BD objective for incident light brightfield and darkfield (M25 thread)
Some immersion objectives with a knurled ring have a front part which can be pushed up and "locked" with a small rotational
movement. This device must be unlocked for observation! The sleeve of PL FLUOTAR and PL APO objectives can be rotated so
that the engraving can be read more easily.
1 2 3
Lettering
Example:
∞/0.17/A
N PLAN 10x / 0.25 PH 1
∞
Infinite mechanical tube length for which the
objective is
microscopes and corresponding objectives with
tube length 160 mm), cf. Fig. 40 and 41.
0.17
Stipulated specimen coverglass thickness. In
the case of dry objectives, the higher the
aperture, the more important it is to keep to the
cover-glass thickness of 170 µm. For an aperture
0.85 the coverglass thickness should only
deviate a few µm at the most from 170 µm to
4 5
designed (there
6 7
506 088
are also
47