Leica DM R Serie Mode D'emploi page 52

Push-on cap CG and IMM
This can be used with some objectives with long
working distances to achieve optimum image
quality with coverglasses (CG) of different
thicknesses. Cap CG 0.4, for example, is
recommended for windows of vessels or for LCD
displays with a thickness between approx. 0.25
and 0.55 mm. Without CG cap 0.4 an optimum
image is achieved, for example, at a wall
thickness of 0.95 to 1.25 mm (C PLAN L 40x/0.50
objective). Immersion cap IMM for enhancing
contrast and observing inner reflections in
incident light brightfield and POL (Fig. 41).
Reduction of reflections
A rotatable birefringent plate attached in front of
the front lens can suppress reflections for
certain incident light objectives and thus
improve image contrast. Used only with crossed
polarizers or Pol filter system.
Interference attachments
For quantitative measurement of roughness, film
thickness, etc. See special instruction manual.
52
Colour code rings on objectives
In accordance with German and international
standards (DIN/ISO) the magnification of each
objective is additionally indicated by a colour
ring above the knurl (41.4):
100x 63x 40x 25x 16x
125x 50x 32x 20x
150x
160x
white dark light dark light
blue blue green green
Immersion objectives have a second coloured
ring further down (41.6):
black Oil or IMM
(= universal objective oil,
water, glycerine)
white water or IMM
orange glycerine
Engraving
order code no. e.g. 506 001
Six-digit factory code number of the objective.
Please always state this code number as well as
the full engraving of the objective when making
technical or commercial enquiries. Objectives
whose code numbers begin with 569. . . and
559. . . can be used under certain conditions if
they have the engraving ∞, see page 45.
However, the engraved magnification value
must be multiplied by the correction factor 0.8x.
Objectives of tube length 160 or 170 (engraving
160 or 170) cannot be used at all.
10x 6.3x 4x 2.5x 1.6x
5x
yellow orange red brown grey
green
1x
1.25x
black