Levenhuk Nelson 8x30 User manual

Levenhuk Binoculars
User manual
Objective lens
Eyepieces
Focusing/diopter adjustment ring
Compass case
Compass light switch (7x50: not shown)
Battery compartment (8x30: not shown)
Tripod socket cover
Strap mount (7x50: not shown)
A
B
C
D
E
F
G
H
Caution! Never look directly at the Sun through this device, as this may cause permanent eye damage and even blindness.
General information
Marine, reliable and sturdy, Levenhuk Nelson binoculars produce a perect at image and are a perect choice or people who like to travel a lot,
especially on the water, and ofen nd themselves in extreme situations and harsh conditions, where regular binoculars just would not do. The
rugged shell protects the intricate optical system inside from any sudden impacts or moisture, and withstands poor weather conditions, rain
and sea waves.
Features:
• High-quality Porro prisms made of fully multi-coated BaK-4 optical glass;
• Waterproof shells (IPX7), embossed for the perfect grip;
•Eyecups made osof rubber;
• Individual focusing and diopter adjustment mechanisms;
• Built-in compass with diode light for easy orienting in any light conditions;
•Rangender scale or convenient measuring othe observed object’s size or distance to the object;
•Adaptable to a tripod (purchased separately).
The kit includes: Levenhuk Nelson binoculars, dust caps for eyepieces and objective lenses, strap, pouch and optics cleaning wipe, batteries,
user manual and warranty.
Focusing and diopter adjustment
Your lef eye vision might be dierent rom that oyour right eye and you might need to adjust the diopter settings and ocus the image. The
ocusing is individual, which is typical or marine binoculars. Each optical tube is ocused independently.
Follow this procedure to adjust focus and diopter setting:
•Set right and lef eyepiece to zero.
•Look through the binoculars at an object about 100 meters away.
•Close your right eye and rotate the lef ocusing wheel until the view is ocused in the lef eyepiece; then, do similarly or the lef eye and
right eyepiece.
The binoculars are now adjusted to your eyesight. Note the diopter adjustment or urther reerence.
Interpupillary distance adjustment
Look through the binoculars’ eyepieces with both eyes. To adjust the interpupillary distance, keep varying the angle between the binoculars’
parts (relative to its central axis) until the image merges into a single circle. Remember the setting or uture use.
Levenhuk Nelson 8x30 Levenhuk Nelson 7x50
EN

Using eyecups
We recommend setting the eyepieces in the lowest position or observations while wearing eyeglasses. For observation without glasses, set
the eyepieces in the upper position.
Fold down the sof part othe eyecup inside or outside othe eyepiece (or lower position); pull out the sof part othe eyecup (or upper
position).
Do not apply excessive pressure as this may damage the eyecups.
Using the compass
Your binoculars are equipped with a directional compass. Iyou look into the eyepieces, you will see a scale in degrees (350...360...) at the lower
edge oyour eld oview. The directional compass show orientations in terms oangles, where the North is represented as 360°, East as 90°,
South as 180° and West as 270°. Each graduation represents 1°. Example: I360 is exactly at the centre othe scale you are looking directly to
the north (i180, to the south).
Having the object centered with the rangender scale in the eld oview, read the graduation. The orientation othe object can be identied
rom the reading.
Note: The north indicated by the directional compass is “magnetic north”, which is dierent rom “true north”. The true north is the same no
matter where you are located around the world. The magnetic north varies depending on your location.
By using the binoculars, together with a map and an angle meter, you will then be able to locate precisely your position.
Example: On a boat sailing, the arrow shows the direction your boat is heading or (g. 1).
In Fig.2, by reading the compass in the binoculars, you read 190° rom the boat to the buoy. (The counter-directional angle, 190°−180°=10°,
rom the buoy to the boat.) To locate your position precisely, you need to have a second reerence. In Fig.3, by using the lighthouse as the
second reerence, the direction rom the lighthouse to the boat is 120° (300°−180°=120°) and the buoy (10°).
Compass lighting
In the dark, turn on the compass diode lighting by lightly pressing the light switch. The lighting stays on as long as the switch is depressed. The
lighting powers by two batteries. Ithe light becomes aint, change the batteries. Remove the plastic battery compartment cover by raising it
gently. Open the compartment by turning the latch with a coin and change the batteries matching the correct polarity.
Reading the rangefnder scale
To accurately use the rangender scale, you will need to know either the size or distance othe object.
Lighthouse Lighthouse Lighthouse
N N N
Buoy Buoy Buoy
Boat
Boat
120°
300°
190°
190° 10°
Fig. 1 Fig. 2 Fig. 3
Fig. 4

1) Levenhuk Nelson 7x50 model
Nelson 7x50 has three concentric circles onumbers on an objective tube. The inner circle represents the rangender scale reading. The outer
circle onumber represents the distance. The circle onumbers in between represents the object size.
Turn the rotatable zone othe plate and stop when the arrow points to the number othe rangender reading. Iyou already know the object
size, nd the number othe object size on the plate, and the corresponding number othe outer circle is the distance to the object. Iyou already
know the distance, nd the number odistance on the plate, and the corresponding number othe middle circle is the object size.
Example: To determine the distance to an object you must rst know its size (height). Look at it and measure the image height on the reticule.
A building reaches to 3.9 on the scale (g. 4). Turn the scale ring until the white mark points to 3.9 on the upper scale (A, g. 5). The lower scale
on the ring is the object size. Here, the number 12 (B, g. 5) stands or the known height othe tower and is exactly below the number 400
(C, g. 5) on the distance scale. Thereore, the building is 400m away rom you.
When you know the distance to the object, you can determine its size (height).
Example: The building is 300m away rom you. Look at it and measure the image height on the reticle. It reaches to 3.9 on the vertical scale.
Now turn the scale ring until the white triangle points to 3.9 on the upper scale. Over “300” on the distance scale is the number 9 on the object
size scale. The building height is thereore 9m.
2) Levenhuk Nelson 8x30 model
For Nelson 8x30, you can use ormulas to calculate the distance to the object (when you know its size) or the object’s size (when you know the
distance.)
When you know the object’s size (in centimeters), calculate the distance to the object (in meters):
Example: Object size (you know) is 51cm, rangender scale reading is 1.7 units. Calculate the distance to the object: 100 × 51 / 1.7 = 3000m.
When you know the distance to the object, calculate the object size (height):
Example: Distance (you know) is 3000m, rangender scale reading is 1.7 units. Calculate the object height: 3000 × 1.7 / 100 = 51cm.
Fig. 5
A
BC
Size =
Distance =
100
rangender scale reading
distance × rangender scale reading
100 × size
1
2
140 200
300 400
600
345 6 78
9
10 12 14 16
0·4
0·8
0·6
0·3
50 60 70 80
100
1·2 1·6
2·5
2
3

Nelson 8x30 Nelson 7x50
Prism type Porro Porro
Prism material BaK-4 BaK-4
Optics fully multi-coated fully multi-coated
Objective lens construction 4 elements in 3 groups 3 elements in 2 groups
Eyepiece lens construction 2 elements in 1 group 2 elements in 1 group
Magnication 8x 7x
Objective lens diameter (aperture) 30mm 50mm
Field of view
8°
139f/1000yds
139m/1000m
7°
122f/1000yds
122m/1000m
Exit pupil diameter 3,75mm 5mm
Eye relief 18mm 23mm
Relative brightness 14 51
Twilight factor 15.49 18.7
Resolution threshold 6.5" 5.5"
Interpupillary distance 56–76mm 56–76mm
Focusing individual for each eyepiece individual for each eyepiece
Close focus 10f
3m
13f
4m
Eyecups foldable foldable
Diopter adjustment ±5 ±5
Waterproof + +
Nitrogen-lled + +
Adaptable to a tripod + +
Operating temperature range −4… +130 °F
−20… +55 °C
−4… +130 °F
−20… +55 °C
Body material plastic plastic
Built-in compass + +
Batteries type (compass light) LR44 (2pcs) LR936 (2pcs)
The manuacturer reserves the right to make changes to the product range and specications without prior notice.

Care and maintenance
•Never, under any circumstance, look directly at the Sun, another bright source of light or at a laser through this device, as this
may cause PERMANENT RETINAL DAMAGE and may lead to BLINDNESS.
• Take necessary precautions when using the device with children or others who have not read or who do not fully understood these
instructions.
•Do not try to take the device apart on your own. For repairs oany kind, please contact your local specialized service center.
•Do not touch the optical suraces with your ngers. You can use a sof napkin or a cleaning wipe, dipped in ether or absolute alcohol, to
clean lenses. We recommend using special optics cleaning uids rom Levenhuk. Do not use any corrosive or acetone-based uids to clean
the optics.
•Abrasive particles, such as sand, should not be wiped olenses, but instead blown oor brushed away with a sof brush.
•Do not apply excessive pressure when adjusting ocus.
•Protect the device rom sudden impacts and excessive mechanical orce.
•Store the device in a dry, cool place away rom hazardous acids and other chemicals, away rom heaters, open re and other sources o
high temperatures. Do not use the device or lengthy periods otime, or leave it unattended in direct sunlight. Always store the device in a
special case.
•We recommend keeping the silicate gel pack, iincluded in the kit.
• During long storage, a thin white lm may appear on the rubber armor. You can wipe it clean with a clean napkin.
•Seek medical advice immediately if a small part or a battery is swallowed.
Battery safety instructions
•Always purchase the correct size and grade obattery most suitable or the intended use.
•Always replace the whole set obatteries at one time; taking care not to mix old and new ones, or batteries odierent types.
•Clean the battery contacts and also those othe device prior to battery installation.
•Make sure the batteries are installed correctly with regard to polarity (+ and -).
•Remove batteries rom equipment that is not to be used or an extended period otime.
•Remove used batteries promptly.
•Never attempt to recharge primary batteries as this may cause leakage, re, or explosion.
•Never short-circuit batteries as this may lead to high temperatures, leakage, or explosion.
•Never heat batteries in order to revive them.
•Remember to switch odevices afer use.
•Keep batteries out othe reach ochildren, to avoid risk oingestion, suocation, or poisoning.
•Do not disassemble batteries.
•Utilize used batteries as prescribed by your country laws.
Levenhuk International Lifetime Warranty
All Levenhuk telescopes, microscopes, binoculars and other optical products, except for accessories, carry a lifetime warranty against defects
in materials and workmanship. Lietime warranty is a guarantee on the lietime othe product on the market. All Levenhuk accessories are
warranted to be free of defects in materials and workmanship for six months rom date oretail purchase. The warranty entitles you to ree
repair or replacement othe Levenhuk product in any country where a Levenhuk oce is located iall warranty conditions are met. For urther
details please visit our web site: www.levenhuk.com/warranty/
Iwarranty problems arise, or iyou need assistance in using your product, contact the local Levenhuk branch.
Levenhuk, Inc. 924-D East 124th Ave. Tampa, FL 33612 USA
Levenhuk®is a registered trademark of Levenhuk, Inc.
© 2019 Levenhuk, Inc. All rights reserved.
www.levenhuk.com
20181225