3. Coarse and fine focus adjustments
a) Coarse adjustment is too tight. Tension adjustment ring is tightened
Loosen tension adjustment ring
too much.
properly.
b) Stage drops and specimen goes
Tension adjustment ring is too Tighten ring properly.
out of focus. loose.
4. Observation tube
a) Incomplete binocular vision. lnterpupillary distance is not cor-
Correct interpupillary distance.
rectly adjusted.
Diopter adjustment is incomplete. Complete diopter adjustment.
User is unaccustomed to binocular
Prior to looking at specimen details,
vision.
try to look at the entire field of
view, or look at a far away object
before resuming observation.
5. Stage
a) Image easily goes out of focus
Stage is not clamped. Clamp stage securely.
when you touch stage.
b) Specimen stops midway on the Specimen is not correctly positioned
Adjust specimen positioned.
east-west traverse. on stage.
Objective is protruding so as to hit Lower nosepiece and then rotate.
against stage insert plate.
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