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8. Operation
8.4 Tubes
Note:
Close any unused tube openings, as otherwise
stray light can interfere with observation.
Adjusting the Viewing Distance
• Adjust the viewing distances of the eye-
pieces so that a congruent total image is
seen (Fig. 52).
Adjusting the Viewing Angle
• For the HC LVB 0/4/4 and HC -/0/4 ergonomy
tubes, the viewing angle can be adjusted by
tilting the binocular viewer.
Ergotube (long, swivelable):
Ergotube (short, swivelable):
• For the AET22 and EDT22 ergotubes, the view-
ing angle can be adjusted by tilting the bin-
ocular viewer in the range of 5° - 32° (Fig. 53).
Fig. 52
Tube setting
∩
Personal eyebase settings
1 Scale (mm), 2 Intermediate module*, in illustration: Ergo
module
46
Adjusting the Eyepiece Section to the Arm
Length
• On the AET22 tube, the eyepieces can be
extended up to 30 mm (Fig. 53).
Beam Splitting in Photo Tubes
EDT22 tube:
The beam splitting between the observation and
documentation outputs has a definite presetting
(50%:50%).
BDT25+ tube:
The beam splitting is set manually by pulling out
a control bar.
Control Bar
VIS
50/50
PHOTO
0° - 35°
7.5° - 32.5°
Fig. 53
1
∩
2
Observation
100%
50%
0%
With AET22 tube individual adjustments
Photo
0%
50%
100%
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