Leica DM R Serie Mode D'emploi page 44

If the tube factor (TF) is not 1x, this value must
be divided by the tube factor as well. Example:
Polarized light microscope or zoom system with
TF = 1.6x
Objectfield = 0.5 : 1.6 = 0.3 mm.
M
The eyepiece has a focusable eyelens (36.4) and
therefore allows individual focusing of the edge
of the field of view, inserted graticules or over-
laid markings. Adjustment range = ± 4 dioptres.*
The light-coloured ring (36.5) that becomes
visible under the adjustable mount marks the
setting for a person with normal or corrected
eyesight when used without a graticule (when a
graticule is inserted the standard setting is
about 0.5 mm above this mark).
Assembly of graticules* in M eyepieces
Important: Be extremely careful to avoid dust
and fingermarks, as these will be visible in the
field of view. The graticule diameter is always
26 mm for HC L PLAN eyepieces.
10x/25 and 2.5x/16 eyepieces only: Screw the
retainer ring of the underneath of the eyepiece
(36.6). 10x/22 and 10x/25 eyepieces only: Screw
out the bottom part of the eyepiece (36.8) and
screw out the retainer ring with a blunt blade.
Insert the graticule with the coated side
downwards (in the direction of the objective) so
that any lettering is seen the right way round
when later observed in the viewing direction.
Screw the retainer ring and the bottom part of
the eyepiece back in.
44
The eyepiece can be used both with and without
spectacles. When wearing spectacles, pull off
or push back the anti-glare protection (36.7), as
otherwise part of the field of view may not be
visible.
Photoeyepieces*
The HC L PLAN eyepieces (fitting diameter 30
mm) are designed for direct visual observation
only. Special eyepieces with fitting diameter of
27 mm and the engraving HC . . . PHOTO are used
for the adaption of photomicrographic equip-
ment with a fixed magnification factor, e.g.
DM LD and MPS systems and for special TV
adaption systems.
Assembly of eyepieces
Only use identical eyepiece types (left-right)!
Exception: polarized light microscopy: The right-
hand eyepiece on polarized light microscopes
has lines and a scale division (e.g. for length
measurements, see page 105). Due to a double
clickstop (31.7) the right hand eyepiece can be
set with the crosslines aligned at the north
south/west position (horizontal/vertical) or at an
angle of 45°. The crosslines then show the
transmission directions of the polarizers or the
vibration directions of the object in its brightest
orientation (diagonal position).
* It is possible to extend the dioptre compensation by
having an ophthalmic optician center antireflection
coated spectacle lenses (2 – 3 dioptres) and inserting
them into the glare protection ring (36.7). However, this
method is not generally recommended by Leica.