Leica DMIL Mode D'emploi page 74

Tubes from the DM L range
The use of tubes from the DM L range requires a
tube adapter. The DM IL/L tube adapter is an
intermediate tube with a length of 60 mm and
without optics which is used to adapt the pupil
position. It has a tube changer ring at the bottom
and a tube changer area for the DM L tubes at
the upper end.
The following tubes can be used:
Binocular tube HC LB 0/3/4 and HC LBP 0/3/4
Trinocular tube HC L1T 4/5/7 and HC L1TP 4/5/7
Trinocular tube with 3 switch positions HC L3TP 4/5/7
Ergo tube, binocular HC LVB 0/4/4
Ergo photo tube, trinocular HC L1VT 0/4/4
Field of view number of DM L tubes
The type designation of DM L tubes also con-
tains a combination of numbers to indicate the
maximum admissible eyepiece fov number, e. g.
binocular tube HC LB 0/3/4.
The numbers 0/3/4 indicate the maximum
admissible height index of the intermediate
modules for the eyepiece field numbers 25, 22
and 20.
In the above example, this means:
1st number (0): fov 25 can only be obtained if the
tube is directly mounted onto the microscope,
i. e. without an intermediate system.
2nd number (3): fov 22 is only possible up to
height index 3, e. g. magnification changer L3/25.
3rd number (4): fov 20 up to max. height index 4,
e. g. 2 Ergo modules L 2/25.
If the number is replaced with a hyphen –, e. g.
monocular tube LMP –/–/7, the tube cannot be
used for the corresponding fov at all; in the above
example, this means it cannot be used for fov 25
and 22, while fov 20 is possible up to index 7.
Exceeding the admissible values can result in
vignetting (shading at the edges of the image).
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HC label: Only eyepieces of type HC PLAN and
widefield 16x and 25x can be used. If there is no
HC label, this means that eyepieces of the type
Leica L PLAN have to be used.
Additional examples:
0/4/4 Field of view 25 is only possible with direct tube
mounting to the microscope stand (height index
of intermediate modules = 0), provided that
suitable objectives are used.
Fov 20 and 22 are possible up to height index 4,
e. g. with the fluorescence device. The addition
of a further module would not be admissible; a
solution to the problem would be a tube with the
following characteristics:
4/5/7 Fov 25 is possible up to height index 4 (e.g. 2 Ergo
modules L2/25 or magnification changer L3/25).
Fov 22 is possible up to height index 5, fov 20 up to
height index 7 (e. g. illuminator LRF 4/20 plus
magnification changer L3/245).
–/–/7 The tube allows fields of view up to 20 mm only.
If intermediate modules are used, the total of
their height values must not exceed 7.