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when looking at a flower, you can focus of the upper surfaces of the petals. Then, slowly turn the focusing knob
to bring into sharp focus other features at difference levels of the specimen.
9. Change magnification by installing 2x auxiliary lens on microscope as follows:
A. First remove the knurled black trim ring from bottom of the fixed 2x objective lens.
B. Carefully thread the 2x auxiliary lens onto threads located at the bottom of 2x fixed objective lens by rotating
lens in a clockwise direction.
C. Holding viewing head with one hand, loosen locking knob located on back of focusing assembly so that
head can move freely down on post.
D. Looking through microscope, move viewing head down on post until object can be seen in approximate
focus. Tighten focusing assembly locking knob. The distance between specimen and objective lens will be
about 40mm when microscope is in focus.
Fixed Built in 2X
Auxiliary Lens 2X
MAINTENANCE
WARNING: For your own safety, make certain that battery recharger is unplugged and cord removed
from microscope jack before maintaining your microscope.
1. OPTICAL MAINTENANCE
Prior to cleaning any lens surface, brush dust or dirt off lens surfaces using a camel hairbrush. Or use air to
blow dust and lint off surfaces. Use of compressed air in a can, available at any computer supply store, is a
good source of clean air.
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.
Do not attempt to disassemble any lens components. Consult a microscope service technician when any
repairs not covered by instructions are needed
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. Coarse focus tension adjustment:
Coarse focus tension adjustment prevents the head from drifting down from its own weight and causing the
image to move out of focus. The tension adjustment has been adjusted to appropriate tension at the factory.
However, after some period of use, tension can loosen, and the stage will "sink" from its own weight or from
Microscope Specification Chart
Objective
Field of
View
9mm
4.5mm
Working
Magnification with
Distance
WF10X eyepiece
85mm
40.mm
5
20X
40X
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