Steiner Optik Steiner Nighthunter XP - Manual (Page 8)

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Objective lens diameter
This number affects the objective lens surface area
through which light enters the binocular. The larger the
objective lens, the more light that is able to get into the
binocular. Your image will be brighter at dusk, at night or
in other low light conditions. With an 8x44 binocular the
objective lens diameter is 44 millimeters - in contrast to
the usually available 42 millimeter sizes your STEINER
XP binocular will offer a 10% larger objective lens surface.
Field of view
The size of a binocular's field of view is stated in feet or as
an angle and uses the value of reference at 1,000 yards. If
your binoculars offer you a field of view of 390, then you
will be able to see a 390 feet wide image at the distance
of 1,000 yards.
After years of research our engineers have created a new
level of perfection with our XP Technology: enjoy your
new STEINER XP binoculars. In contrast to other binocu-
lars, XP Technology enabled STEINER to achieve higher
light transmission over the entire visible wavelength
range. A difference you will instantly see in all conditions.
However, several factors determine the optical perfor-
mance of a binocular. They perform to the maximum only
when all these parameters are optimally calibrated and in
harmony with each other.
Magnification
The value indicates how much closer an object appears
through the binocular. The higher the magnification, the
closer the object appears. However, similar to a photogra-
phic zoom lens, a higher magnification narrows the field
of view. With an 8x44 binocular, objects will appear to be
eight times closer than with your naked eyes.
Cleaning
Clean your binoculars by wi-
ping the rubber armoring with
a damp cloth. More stubborn
dirt may require a light soap
and water solution on a damp
cloth. The Nano Protection
Optics of your XP binoculars
repels dirt or water to form on
the lenses – simply wipe the
objective or ocular lenses
gently with the cleaning cloth
that came in the original box.
Clean the lenses only when
necessary and never use any
acrid cleaning solutions.
GETTING THE MOST FROM YOUR STEINER XP BINOCULARS.
Formula for Exit pupil:
Exit pupil =
Objective lens Diameter
Magnification
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Exit pupil
Look through your binoculars and then move it about 12
inches away from your eyes. You will see a bright circle
within the oculars. This dictates how much light gets to
your eye. The exit pupil is measured in millimeters (mm)
and is a crucial indicator for low-light performance of a
binocular. A human pupil can open up to 6 mm in low
light and accordingly, binoculars that are used in low-light
c o n d i t i o n s
should offer a
large exit pupil.
Storage
When not using your STEINER XP binoculars you should
store them in a cool dry spot. Avoid storage in spaces ex-
posed to direct sunlight (i.e. in a car) or with extreme
temperature changes.