12
(contrast or definition
isn’t enough)
Surface of objective lens is
dirty (especially it is easy for
the front lens of 40X
objective to dip in immersion
oil)
Clean it
Immersion oil isn’t used for
100X objective (oil)
Use immersion oil
Immersion oil doesn’t meet
the requirement
Use immersion oil
supplied by us
There is bubble in immersion
oil
Clear the bubble way
Size of iris aperture isn’t
proper
Adjust the size of iris
aperture
Position of condenser is too
low
Readjust the position of
condenser
One side of image is
dark or image is moving
as focusing
Objective isn’t in correct
position
Make the objective in
correct position
Specimen isn’t placed
correctly
Place specimen levelly
on stage and clip it with
clamp
Objective touches
specimen as changing
low times objective to
high times objective
Cover glass of specimen isn’t
in up direction
Place specimen correctly
Cover glass doesn’t meet the
requirement
Use required thickness
cover glass (0.17mm)
Image observed by two
eyes aren’t in
superposition entirely.
Interpupilary distance isn’t
adjusted correctly
Adjust interpupilary
distance according to two
eyes
It is easy for eyes to be
tired during observing
Diopter isn’t adjusted
correctly
Readjust diopter
