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c) When changing to the 40x and 100x objective lens, care must be exercised when positioning these lenses into
the optical path, in order to prevent damaging the front lens element and specimen slide.
d) In order to obtain maximum resolution of the 100x oil immersion lens, it is necessary to apply immersion oil
between the coverglass of slide and front lens of the objective.
(1) Use of a very small amount of immersion oil is required.
(2) All air bubbles must be removed from between lens and slide by gently rotating nosepiece back and forth.
(3) When finished viewing, all parts that come in contact with oil must be cleaned. Failure to do so could
permanently damage the 100x oil objective lens. Use of Windex to clean immersion off lens surfaces is
recommended.
Objective
Din 4X
Din 10X
Din 40X
Din 100X
MAINTENANCE
WARNING: For your own safety, turn switch off and remove plug from power source before maintaining your
microscope. If the power cord is worn, cut or damaged in any way, have it replaced immediately to avoid shock
or fire hazard.
1. OPTICAL MAINTENANCE
A. Do not attempt to disassemble any lens components. Consult a microscope service technician when any repairs
not covered by instructions are needed.
B. Prior to cleaning any lens surface, brush dust or lint off lens surface using a camel hair brush. You can also use
an ear syringe or canned compressed air, such as that sold by most computer stores.
C. Do not remove eyepieces or objective lenses to clean. Clean only the outer lens surface. Breath on lens to
dampen surface, then wipe with lens paper or tissue or use a cotton swab moistened with distilled water. Wipe
lenses with a circular motion, applying as little pressure as possible. Avoid wiping dry lens surface as lenses are
scratched easily. If excessive dirt or grease gets on lens surfaces, a small amount of Windex can be used on a
cotton swab or lens tissue. To clean objective lenses, do not remove objectives from microscope. Clean front
lens element only, following same procedure.
NOTE: Fingerprints or other matter on the front lens element of the objective lens is the single most common
reason that you will have difficulty in focusing the microscope. Before having costly servicing done, or before
returning to National for "warranty repair", make certain to examine the front lens element with a magnifying glass
or eye loupe for the presence of such contaminants. If a microscope is returned to National for warranty repair,
and it is determined that such contaminants are the problem, this is not covered under warranty and National will
submit a cost estimate for cleaning.
2. MECHANICAL MAINTENANCE
A. The rack stop screw has been pre-adjusted at the factory and should not require re-adjustment. However, if you
do attempt re-adjustment, note the following procedure. Using a 2mm "L" type hex key wrench, loosen rack stop
socket set screw. With fine focus adjustment at mid-range, focus on standard slide until sharp image is obtained.
Rotate rack stop set screw in clockwise direction until tight.
B. Coarse focus tension adjustment prevents the stage from drifting down from its own weight and causing the image
to move out of focus. This has been adjusted at the factory, but over the course of time it may loosen and cause
the stage of the microscope to slip downward on the focusing block.
Microscope Specification Chart
N.A.
Color Code
Ring
0.10
Red
0.25
Yellow
0.65
Blue
1.25
White
Field of
Working
View
Distance
4.5mm
26.4mm
1.8mm
5.5mm
0.45mm
0.48mm
0.18mm
0.06mm
5
Magnification with
WF10X eyepiece
40X
100X
400X
1000X
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