38
4.2 Observation tubes
Fig. 55
HCI B 22
Binocular tube
45° viewing angle
Field of view index up to 22
Eyepiece diameter 30 mm for HC PLAN 10x/20 or
22 eyepieces
Interpupillary distance setting: 55–75 mm
Fig. 22
(see p. 22)
HCI BV 22
Ergonomic binocular tube
15°–50° viewing angle
Field of view index up to 22
Eyepiece diameter 30 mm for HC PLAN 10x/20 or
22 eyepieces
Interpupillary distance setting: 55–75 mm
Fig. 56
HCI 3T 22
Trinocular tube, 45° viewing angle
Light path: 100 % vis
– switching rod
50 %-50 % – switching rod
100 % photo – switching rod
Field of view index up to 22
Eyepiece diameter 30 mm for HC PLAN 10x/20 or
22 eyepieces
Interpupillary distance setting: 55–75 mm
For trinocular tubes HCI 3T 22 the light path is pre-
selected with the switching rod at the side (56.2).
See chapter 5.1, Accessories on how to operate
trinocular tubes HC FSA 25 PE
Setting the interpupillary distance:
The binocular tubes have to be adjusted to the
individual interpupillary distance of the user.
This is done by pulling the eyepiece tubes apart
or pushing them together with both hands until
the two part images in the microscope superim-
pose.
Only one single, circular, clear image is seen.
Compensation of defective eyesight
For viewers with normal eyesight and those wear-
ing eyeglasses, the eyelenses of the eyepieces
are adjusted to the normal position.
The normal position of the eyepiece eyelenses is
indicated by a light-coloured engraving encom-
passing the base part of the eyepiece.
Viewers with defective eyesight should first look
through the left eyepiece with their left eye and
focus the specimen with the fine drive. Then they
should look at the same area of the specimen
with their right eye and rotate the eyelens of the
right-hand eyepiece (without adjusting the fine
drive) until a sharply focused image is obtained.
For eyepieces with inserted graticule, first focus
the eyepiece on the graticule, removing the spe-
cimen from the light path or bringing it greatly out
of focus. Focus the graticule by adjusting the
eyelens (make sure your eye is relaxed; this is
best done by looking out the window at a distant
object for a moment).
After this, only focus the specimen through the
eyepiece with graticule. With your other eye,
focus the eyepiece without graticule with the
eyelens of this eyepiece.
n.b.:
If you are wearing eyeglasses, push back the
anti-glare protection of the eyepieces (push-
back eyecups, 55.3).