04
Diopter Adjustment and Focusing
1. Adjust eyecups interpupillary distance as described 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 objective (front) lens of the same
side of the binocular that has the diopter adjustment ring. This is usually the
right side.
5. Using the center focus wheel, focus on a distant object with fine detail (e.g.,
brick wall, tree branches, 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 dipoter 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.
Neckstrap Attachment
To securely attach your binocular to the binocular strap:
1. Thread the end of the strap from the bottom up through the strap
attachment loop.
2. Hold the buckle and thread the end of the strap inside the buckle.
3. Adjust the overall length and pull the strap webbing tight so it is secure
within the buckle.
#615/617/616/618
Diopter
Adjustment
Ring
Diopter
Adjustment Marker
