Chapter 3 Operation
3.9 Eyepiece Tube Operation
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3.9 Eyepiece Tube Operation
3.9.1 Diopter Adjustment
Diopter adjustment corrects the difference in the left and right fields of view, making binocular observation
easier. The eyepiece tube length will be maintained, allowing for the objective to perform optimally with
minimal focus loss upon objective change.
To perform diopter adjustment, follow the instructions below.
Figure 3-21 Diopter adjustment
1. Under bright-field microscopy, adjust the
focus of the 10x objective onto the specimen.
2. On each eyepiece, rotate the diopter
adjustment ring to align its lower end with the
marking on the eyepiece.
This will be the reference position for diopter
adjustment.
3. Move the 40x objective into the optical path.
4. Look into the left eyepiece with your left eye.
Adjust the focus onto the specimen by
rotating the focus knobs.
5. Move the 10x objective into the optical path.
6. Look into the left eyepiece with your left eye.
Adjust the focus onto the specimen by
rotating the diopter adjustment ring on the
left eyepiece.
Do not touch the focus knobs at this time.
7. Repeat steps 3 through 6 two times.
8. Adjust the right eyepiece.
Repeat steps 2 through 7, but this time using the
right eyepiece instead of the left.
3.9.2 Interpupillary Distance Adjustment
Figure 3-22 Interpupillary distance adjustment
Interpupillary distance adjustment adjusts the
distance between the eyepieces to better suit the
user. This will make binocular observation easier.
When diopter adjustment is complete, move the 10x
objective into the optical path, and adjust the focus
onto the specimen. Look into the eyepieces with
both eyes, and adjust the interpupillary distance of
the binocular part so that the two fields of view
overlap into one.
The binocular part has an interpupillary distance
scale. It is recommended that you remember your
own interpupillary distance for easier adjustment in
the future.
Diopte
adjustment ring
Markin
Adjust interpupillary
distance of binocular part
to merge fields of view.
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