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Eyepiece Distance Adjustment
For best viewing, the binoculars should be adjusted for the individual user so that eyepieces line up with the user' s eyes. The
distance between the eyes, called "interpupillary distance," varies from person to person. To achieve perfect alignment of lens
to eye, follow these simple steps:
1. Hold your binoculars in the normal viewing position.
2. Grasp each barrel firmly. While looking through the binoculars, move the barrels closer together or farther apart until you
see a single circular field. Reset your binocular to this position each time you use it. The eye distance setting is indicated
on the scale located on the binocular hinge.
Diopter Setting and Internal Center Focus
The diopter setting corrects for vision differences between the user' s two eyes, so the binoculars can be focused correctly for
both eyes. To adjust the diopter:
1. Set the right eyepiece to 0 and look at an object that is approximately 100 feet (30 m) away.
2. Keeping both eyes open, cover the right objective (front) lens with your hand.
3. Adjust center focus wheel until image in the left eyepiece appears sharp.
4. Cover the left objective (front) lens, then rotate the right eyepiece until the image appears sharp again.
5. The diopter setting is now correct for your eyes, and you need only adjust the center focus to view objects at different
distances. Note the diopter setting for future use.
Fold-down Eyecups
To use binoculars while wearing eyeglasses or sunglasses, fold the rubber eyecups down. This will allow you to bring your
eyes closer to the binoculars, improving your field of view. To use binoculars without glasses, fold the rubber eyecups up into
the extended position..
Reading the Rangefinder Reticle
The rangefinder scale is a useful navigation tool if you know the size or distance of an object. If you know an object' s size, you
can use the rangefinder to calculate its distance. Conversely, if you know the object' s distance, you can calculate its size.
1. To measure distance, simply apply the following formula:
Distance =
Example (to find distance): if the object is 20 meters high and the rangefinder scale
reading is 16 (Fig. 3), then:
16 (rangefinder scale reading)
2. To measure object size, the formula becomes:
Object Size =
Example: if the object is 1,250 meters away and the rangefinder scale reading is 16,
then:
1,250 m (distance) x 16
[400C]
1000 x Object Height
Rangefinder Scale Reading
20 m (height) x 1000
Distance x Rangefinder Scale Reading
1000
1000
westmarine.com
= 1,250 m (distance)
= 20 m (object size)
1-800- BOATING
3
Fig. 2
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