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5.3 Adjusting the interpupillary distance
(For binocular and trinocular devices)
With binocular viewing, the interpupillary distance
must be adjusted accurately for each user, in
order to achieve a clear image of the object.
While you are looking through the eyepieces, use
your hands to hold the righthand and lefthand tube
housing firmly. By pulling them apart or pushing
them together, you can either increase or reduce
the interpupillary distance (see illustration). As
soon as the field of views of the lefthand and
righthand eyepieces completely overlap each
other, i.e. they combine to form a circular image, then the interpupillary distance is
set correctly.
5.4 Dioptre adjustment
(For binocular and trinocular devices)
The eye strengths of each eye of the microscope user can often be slightly different,
which in daily life has no consequences. But when using a microscope this can
cause problems in achieving precise focussing.
You can use a mechanism on the left tube connector (dioptre adjustment ring) to
compensate for this as follows.
1. Look through the right eyepiece with the right eye and bring the object into focus
by using the coarse and fine adjustment knob.
2. Then look through the left eyepiece with the left eye and use the dioptre
adjustment ring to focus the image.
To do this, you just need to turn the ring in both directions (see illustration), to find
out where the image is at its most focussed.
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