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Rolled Eyecup
Eyecup Adjustment
Your ALPEN binocular is fitted with eyecups which
can be rolled or twisted up or down (depending on
your model) to optimize the view for your eyes and
to exclude extraneous light. If you are not wearing
eyeglasses or sunglasses, keep the eyecups fully
extended („up“ position). If you are wearing glas-
ses, roll down the eyecups or twist them to the
down position. This will bring your eyes closer to
the binocular’s eyepiece (ocular) lens to ensure you
can see the entire image (full field of view with no
“cutoff” or “tunnel vision”).
IPD (Interpupillary Distance) Adjustment
The distance or spacing between the center of the
pupils, called “interpupillary distance” (IPD) varies
from person to person. To adjust the binocular to
match your eyes, follow these simple steps:
1. Hold your binocular in the normal viewing posi-
tion. Grasp each barrel firmly.
2. Move the barrels closer together or further apart
until you see a single circular field (don’t worry
about focus yet).
3. Always re-set your binocular to this position
before using it.
Twisted Eyecup
Rolled Eyecup
Diopter Adjustment and Focusing
1. Adjust eyecups interpupillary distance as descri-
bed in the previous sections.
2. Set the diopter adjustment ring to zero and view
a distant object.
3. Keep both eyes open at all times.
4. Using a lens cover or your hand, cover the objec-
tive (front) lens of the same side of the binocular
that has the diopter adjustment ring. This is usu-
ally the right side.
5. Using the center focus wheel, focus on a distant
object with fine detail (e.g., brick wall, tree bran-
ches, etc.) until it appears as sharp as possible.
6. Uncover the objective lens on the diopter side,
cover the other objective lens, the left side, then
view the same object.
7. Using the diopter adjustment ring, move the di-
opter adjustment marker to the “+” or “-” till you
reach focus.
Caution should be used as over turning or forcing
the diopter ring can cause damage or cause the
eyepiece to break away from the chassis.
8. Your binocular should now be adjusted for your
eyesight. Focusing for any distance can now be
done simply by turning the center focus wheel.
Make a note of your diopter setting for future
reference.
Diopter
Adjustment Marker
Diopter
Adjustment
Ring
