6
Focusing the microscope
To focus the sample, use the focusing knobs located on both sides of the head holder.
By turning these knobs, the microscope can be moved up or down a certain distance.
This movement is enabled by a “rack and pinion” mechanism.
Using the focusing knob, focus the sample until the image is clear. If the sample cannot
be brought into focus within the travel range of the S303/S304 pole arm and stand, adjust
the microscope head height along the vertical pillar to a working distance of 57mm from
the sample. Remember to tighten the locking screw and support collar after adjusting the
height of the microscope.
Magnification and working distance
Select the desired magnification strength by adjusting the objective turret. Change the
optional eyepieces to increase magnification range.
Total magnification used can be calculated by multiplying the eyepiece magnification by
the objective lens magnification.
V. Maintenance and repair
Cleaning
Keep all lenses clean. Fine dust on the surface of the lens should be gently blown off with
an air canister or wiped off with a soft lens cloth or lens tissue. Stubborn fingerprint
smudges or oil marks can be wiped off with lens tissue moistened with a small amount of
xylene or a 3:7 mixture of alcohol and ether. Never use organic solutions to clean any
other surface (especially the plastic surfaces). If necessary, please choose a mild
detergent.
Storage
After use, cover the microscope with the dust cover provided and store it in a dry and
clean place free from moisture to prevent rust. Remove the eyepieces when not in use,
and place covers on the eyepiece holders.
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