BINOCULARS
USER INSTRUCTIONS
Compact
(Roof Type)
CR0821
RTL-318-1120K
CR1025
RTL-318-1230K
Traditional
(Porro Type)
TP0845
RTL-318-1020K
TP1050
RTL-318-1010K
Rutland binoculars are designed to provide a sufficient field of view even for
spectacle wearers. Simply fold back the rubber eye cup so as to place the eye
at the correct distance from the lens whilst still wearing your spectacles. The
field of view might otherwise be partially shaded.
(Traditional binoculars only)
To attach the neck strap provided to the binoculars, put the tip of the strap
into the neck strap eyelet (a). Bring the tip back through the neck strap buckle
(b). Use the neck strap holders to retain any remaining length (c).
(Traditional binoculars only)
To support your traditional binoculars over long periods, an optional tripod
adaptor may be used (Adaptor sold separately). Attach the adaptor to the
tripod (a). Unscrew the cover on the front of the binoculars anticlockwise (b).
Connect the binoculars to the tripod by using the screw on the adaptor (c).
Eye cup
extended
a)
b)
c)
a)
b)
c)
Eye cup
folded
High grade optical glass for lenses and prisms
Ensuring maximum light transmission, with bright clear
images reducing eye fatigue in low light conditions.
Smooth operation
Precision mechanical operation provides reliable functionality.
Field
of view
Angle
of view
1000m
l
The first number (8x
40
)
This number indicates the magnification. For 8x 40 binoculars, the
image will appear eight times closer than you would see it with the
naked eye.
l
The second number (
8x
40)
This number represents the diameter (mm) of the objective lens which is
the lens nearer to the object. This effects the amount of light entering
the binocular and the image brightness.
l
Roof (Dach) Prism
Using Dach (German for roof, because of their shape) prisms, these
binoculars offer a slim shape with a straight lens tube.
l
Porro Prism
This is the most widely used design for binoculars. The objective lenses
are offset from the eyepieces.
l
Interpupillary distance
The distance between your eyes which varies from person to person.
l
Angle of view
The width of an area you can see at a given
distance. The size of the field
of view will decrease as
magnification increases.
l
Field of view
The width of the
field seen with binoculars.
Binoculars with a wide field of
view make it easier to scan large areas.
l
Exit pupil
Bright circle seen on the surface of the ocular lens when the binoculars
are held 30cm away from the eye. This is the beam of light that passes
through the binocular into your eyes. Calculation is made by dividing the
objective lens by the magnification.
l
Brightness index
A single figure number which has become the accepted method of
comparing the brightness delivered by the binoculars. Calculated by
squaring the exit pupil diameter. Does not indicate actual image
brightness but is used for making comparisons.
l
Twilight factor
An indication as to how well binoculars will perform in poor light. The
higher the number, the better you can still discern fine details in twilight.
It is achieved by multiplying the objective lens diameter with the
magnification and calculating the square root of the result.
l
Closest focusing distance
The closest an object can be to the user and still remain in focus.
l
Eye relief
The distance from the ocular lens to the point where the users eye can
see the full image. For spectacle wearers Rutland Sport binoculars have
fold down eye cups.
Glossary
Spectacle Wearers
Strap Attachment
Tripod Use
Product specifications outlined in this leaflet are subject to
change without prior notice.
Please retain this information
for future reference.
FOLD
FOLD
FOLD
FOLD
SPORT
™
RUTLAND PRODUCTS
The Forge, Wigston, Leicester,
England, LE18 2FS.
www.rutlandtools.co.uk
© RUTLAND PRODUCTS 02/13
SPORT
™
