Instructions

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PT RUNL ES IT PLDE EN FR
EYEPIECE FOR SPECTACLE WEARERS
An eyepiece for spectacle wearers allows for a full field of view with and without eyeglasses. Its main aim is
the adjustment of the distance from the eye to the ocular (eye relief). When an observer sees a circular image
through the binoculars, the eye relief is set correctly. Without glasses, the optimal distance can be adjusted by
three different ways:
eyecups with a sliding mechanism, eyepieces with a twist mechanism and folding rubber eyecups. For use
by spectacle wearers, these eyecups should be folded down or brought to the flatest possible position; non-
spectacle wearers should use binoculars with eyecups in their extended positions.
BINOCULAR
Optical systems with two oculars are called binocular (hence the name binoculars).
MONOCULAR
Optical systems with one ocular are called monocular.
TWILIGHT OUTPUT
The twilight output number quantifies binocular visual performance and detail visibility in twilight conditions.
Formula:
√Lens diameter x magnification
The result is evaluated purely mathematically and is only of interest when comparing differing types of binocular
(e.g. 8x30, 7x50 and 10x50). The number calculated disregards binocular performance increase due to opti-
cal treatment, top-quality glass types and the like. See luminous intensity for more information.
DIOPTRIC COMPENSATION
In binoculars with centre wheel focusing, the right eyepiece (in zoom binoculars, usually the left) can be ad-
justed.
This compensates for the user’s eyesight deficiencies. In models with single eyepiece adjustment, both eye-
pieces can be turned, as they also serve to adjust the focus.
RUBBER ARMOUR
Binoculars with rubber armour are advisable for rugged, professional uses. The black or olive green rubber
armour protects the instrument against splashing, dropping and impacts. The armour on our instruments has
fast colouring and is proof against sunlight.
COLLIMATION (double image)
This term means the parallel alignment of both halves of a pair of binoculars. If an instrument is subjected to
any major impact or dropped, the prisms may become misaligned, making the instrument out of collimation.
Observation through such an instrument yields double images, as the contours seem to the observer to be
displaced.
Readjusting for eyesight can compensate minor maladjustment of this kind. However, a headache may result if
such an instrument is used for any length of time. Such instruments should always be sent in for repair.