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Poor image quality
No cover slip on the
specimen
Place glass cover slip over
the specimen
Slide is too thick or too thin
Use a lab-quality slide
Slide is placed upside
down on the stage
Flip the slide over so that
the cover slip is facing up
Oil on objective lens
Wipe the lens off with soft
cloth and glass cleaner
Iris aperture is too narrow
or too wide
Adjust the iris aperture
Image moves while
adjusting focus
Slide is shifting on the
stage
Reposition slide more
securely in the slide holder
Light is too dim
Iris aperture is closed too
far
Open the iris aperture
wider
Bulb setting is too low
Increase intensity on the
control wheel
Condenser lens is dirty
Wipe the condenser lens
off with a soft cloth
Voltage is too low
Use the supplied power
adapter
Objective lens collides with
the slide when switching
from a lower to a higher
power objective
Slide is upside down or too
thick
Use a lab-quality slide or
flip the slide over so the
cover slip is facing up
Stage is set too close to
the objectives
Lower the stage with the
coarse focus knob
Safety rack stop needs
adjustment
Adjust the safety rack stop
to stop the stage farther
from the objectives
Image won't come into
focus when using a
higher-powered objective
Slide is upside down
Flip the slide over so the
cover slip is facing up
6
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