INSTRUCTIONS FOR USE
The binoculars you have acquired are a top product with precisionmechanical parts. It is a product of the highest demands of optical imaging performance, according to the latest developments in the optical calculation and optical technology and is robust in processing. Both variants of this series, the one with compass (see cover at front) and the one without compass (see cover at rear), are designed as models for people who wear glasses, are filled with nitrogen and are pressure-water-tight. Model 7×50 C is equipped with a lighted compass and graticule and can be user for rangefinding.
|Model||7×50 / 7×50 C|
|Ø Objective aperture [mm]||50|
|Visual field at [ft at 1000 yd]||444|
|Close range [m||7.1|
|Ø Exit pupil [mm]||19.5|
|Exit pupil longitudinal distance [mm]||24.0|
|Diopter compensation [dpt]||-5.0 to +5.0|
|Pupil distance [mm]||56 – 72|
|Watertightness||5m (0.5 bar)|
|Max. length [mm]||210|
|Max. width [mm]||165|
|Weight [g||1380 / 1450|
SCOPE OF SUPPLY
- NOBLEX cleaning cloth
- 2x batteries LR 43
- Carrying strap
- Carrying bag
- Warranty card
COMPONENTS OF THE DEVICE
1 Battery compartment cap
2 Fold-back-type eyecup
3 Middle hinge
4 Diopter ring
5 Carrying strap holder
6 Eyepiece protective cap
7 Objective lens protective cap
8 Holder for the objective lens protective cap
9 Covering screw, tripod socket
10 Lighting button
11 Daylight inlet
Inserting and removing the battery
First, the battery compartment cap (1) on the objective lens side of the binoculars must be unscrewed (counterclockwise). Then, two lithium batteries LR 43 (included in delivery) must be inserted resp. removed into/from the battery compartment, with the plus-side outwards. After that, the cap must be screwed in again. The service life of the battery in continuous operation is 5-10 hours.
Adaptation of the eyecup
Both models are equipped with fold-back eyecups (2). It helps people who wear glasses and also normal-sighted observers to use the entire visual field of the binoculars. When using the device, people who wear glasses should turn inside out the eyecups and thus they achieve the correct eyepiece – eye distance. The normal-sighted people and people who wear contact lenses should leave the eyecup in the stretched status.
In order to obtain a large, circular and sharply defined image, the binoculars must be adjusted to the eye distance of the respective user. This correction is made by bending the glass around its middle joint (3) until the two visual fields of the right and left scopes completely cover each other when viewing an object.
Adjustment of acuteness of vision and eye defects compensation
Both binoculars variants have an easy-to-use single-eyepiece adjustment and allows the adjustment of the visual acuity from ± 5.0 dpt. The eye defects compensation is done by adjusting the diopter ring (4) of the right and left eyepieces individually for each eye. When looking through, the picture is set individually for the respective eye at the corresponding eyepiece. Make adjustments to the eyepieces until you notice an uniform, sharp and circular image.
Attention: The adjustment for right and left should be done by viewing the same object at about 50m distance, in order to avoid any misadjustment.
If the two eyepieces are set to your acuteness of vision, no readjustment is necessary for observing at different distances. Only for the observation of objects which are close to the near point of the binoculars, a re-adjustment of the eyepieces may be necessary.
Fastening the carrying strap
The carrying strap holders (5) are attached near the two eyepieces. The strap must be threaded through these two eyelets. Please remove the synthetic pins to reach the sling loops. Use a tool such as an allen key to remove the pins and be carefully to avoid any damages (see pictures p. 22). After the carrying strap has been fastened on both sides, the desired length can now be adjusted.
Eyepiece protective cap
The binoculars are equipped with a lens cover (6) to be protected from dust, rain and sand. Just put the cover on the oculars. Further, it is possible to fasten the cover to the sling which is attached to the sling loops.
The cover loop on the right side is slotted to make sure that the cover can be removed one-sided without releasing it completely. During operation of the binoculars, this may cause the eyepiece cover to hang down loosely and does not affect the view.
Fastening the objective lens protective cap
To attach the objective lens protective cap (7) to the binoculars, the loop on the holder for the objective lens protective cap (8) must be placed over the cover of the tripod thread and inserted. The loop must be completely inserted behind the cover.
Mounting on the tripod
The device can be mounted on a standard tripod, by means of the existing connection thread ¼“. For this purpose, the cover (6) located on the underside must be removed.
Attention: The cap has no securing loop and can therefore be easily lost due to the small size. Therefore, pay attention to where you store it while using the tripod thread.
RANGEFINDING BY MEANS OF THE COMPASS
Operation of the compass
An analog compass is integrated in the Noblex 7×50 C, which indicates the respective direction observation, in degrees. North corresponds to 360°, East 90°, South 180° and West corresponds to 270°. With the help of the integrated graticule, distances and object dimensions can be determined. The graduation lines, which range horizontally from -4 to +4 and vertically from 0 to +8, each have a distance of 1mil. Converted to a distance of 1000m, the lines spacing is 1m and thus enables a simple conversion in mind.
Switch on/off of the compass lighting
The compass of the binoculars is equipped with a lighting button. When the button (10) is held pressed, the compass display is backlit in red. When the button is released, the light goes off again.
The daylight inlet (11) is used to illuminate the compass during the day; it is not compelling to switch on the compass lighting. The light passage must not be covered with your fingers, otherwise the display is not readable.
Determination of position by means of the compass
By means of the compass binoculars, the current position can be simply determined with the aid of a topographic map. For a precise determination, a total of two reference values are required here.
One person is traveling by boat, but the current position of the boat is unknown to the boatman and should be determined. In the figure a) below, the drawn arrow illustrates the direction of travel of the boat. The following reference values can be used to determine the position:
Reference value 1: If the user looks on board at the targeted buoy with his compass binoculars, he will see that 190° is displayed. Thus, the difference between the South (180°) and the targeted buoy is 10°.
Reference value 2: The lighthouse drawn and targeted with the help of the compass binoculars, in figure b) is located at 120° from the boat (300°- 180°=120°).
Result: The exact position of the boat can now be determined by superimposing the two determined course lines to the reference points. The current position is where the two lines intersect.
Using the reticles for rangefinding
The integrated graticule serves for determination of distance of distant objects.
If the height or length of the target object is approximately known, the distance can be determined using the following formulas:
Example: The object height of the pictured lighthouse is 60m. For the height of the lighthouse, the value 6.0 can be read on the graticule.
If the target object to be measured is larger than the scale area of the graticule, a feature of the object (chimney, mast, etc.) can also be used for the calculation. It is also possible to proceed step by step and to add up the individually determined values step by step.
Measurement of elevation (vertical angle) for determining the object height
The elevation angle indicates the angle between the horizontal on which the observer stands and a particular point on the targeted object (e.g., the top of the lighthouse). If the elevation angle is within the scale value of the graticule (8mil), then the vertical zero mark of the scale should first be aligned with the base of the lighthouse in order to easily read the angle.
The prerequisite is that the distance to the target object is known. In this example, the distance to the lighthouse is 1200m and the scale value read on the graticule is 6.0.
Height of the target object(m) =
Measurement of the azimuth = horizontal angle for determining the object length
The measurement of a horizontal visual angle is similar to the measurement of the vertical visual angle. For this purpose, the horizontal graticule scale is used. For narrow objects, the long vertical line must be moved to one edge of the object and the azimuth of the object can be read directly on the scale on the other edge of the object (s. Fig., here, e.g. it is 2 mil). In the case of wider objects, any line of the horizontal scale must be moved to one edge of the object and, on the other scale side, the value at the other edge of the object must be read. Now, the azimuth can be obtained by adding the two scale values. On this basis, the length or width of any object can be determined, if one knows the distance to it.
The distance to the front sailing ship is 1200 m. The sailing ship is located on the graticule between the horizontal scale values 0 and 2. Thus, the horizontal visual angle is 2 graduation lines / 20 lines.
MAINTENANCE AND CARE
The prism binoculars require no special care, they are virtually maintenancefree. Optic external surfaces must be cleaned with a fine brush or a soft cloth if necessary. Coarse dirt particle should be rinsed off or blown off before wiping. An excessive rubbing when brushing the optical parts can destroy the anti-reflection coating. No chemical solvents should be used and the binoculars should be stored dry!
Because of the continuous, further development of our products, deviations from the illustrations and the text of this prospect are possible. Its copy – even in extracts – is only permitted with our authorization. We reserve the right of translation. For publications we gladly provide available reproductions of illustrations.