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4.2 Adjust interpupillary distance
hold the right and left parts of the observation head by both
hands and adjust the interpupillary distance by moving the two
parts until one circle of light can be seen. If two circles appear,
the interpupillary distance is too big, and if two overlapped cir-
cles appear, the interpupillary distance is too small.
4.3 Focus and regulation of the focusing tension
Put the sample to be observed on the plate and turn the zoom
to the highest magnification using the bilateral zoom knob. Try
to focus the sample using the focusing knobs.
If necessary adjust the height of the microscope head along
the vertical stand. Remember to lock the lock screw and sup-
port collar after aligning the height of the microscope.
The tension of the focusing knob can be adjusted by rotating
the right focusing knob keeping still the left focusing knob.
4.0 USInG THe MICROSCOPe
4.4 dioptric compensation
This compensation makes it possible for people with glasses to adjust the microscope to their eyes
and use the microscope without glasses. Turn the zoom down to the lowest magnification. Adjust the
diopter compensation ring of the right eyepiece tube until the image of the right eyepiece is clear and
sharp. Repeat the procedure for the left eyepiece. Then, check the focus of the image for the whole
zoom range. It should now be perfectly parfocal (focus is always maintained during the change of
magnification).
4.5 Magnification and working distance
The total magnification varies from 1.75x to 180x depending on the eyepieces and auxiliary objecti-
ves used. with the bilateral zoom knob, the user can change the magnification in a factor of 6.4 with
perfect parfocality and the image is always centred.
Select the desired magnification by adjusting the bilateral zoom knob. Change the eyepieces and/or
add an appropriate magnifying objective lens if necessary. The total magnification used can be cal-
culated by the following equation:
Total magnification = Eyepiece magnification x Zoom magnification x Objective lens magnification
Normal working distance for the standard configuration (1x objective lens) is 95 mm.
