ESSLNB B09496NJHG Marine Binoculars for Boating Instruction Manual

ESSLNB B09496NJHG Marine Binoculars for Boating

Product Information

Specifications

• Model: 10 x 50
• Magnification: 10x
• Objective Lens Diameter: 50mm

General Overview

The 10 x 50 Military and Marine Binoculars are designed for outdoor use and are suitable for military and marine applications. These binoculars provide a clear and magnified view of distant objects.

Technical Specifications

The technical specifications of the 10 x 50 Military and Marine Binoculars are as follows:

• Magnification: 10x
• Objective Lens Diameter: 50mm

Construction Specifications

Optical system

The basic binocular construction consists of the following components:

1. Objective lens
2. Porroprisms
3. Reticle
4. Eyepiece

Basic binocular construction

The objective lens, Porroprisms, reticle, and eyepiece are the main components of the binoculars. The reticle and compass module are built into the right half of the binoculars body.

How Binoculars work

The light from the object enters the binoculars through the objective lens system. The rays are converged to an upside-down image. The prism system, known as the Porroprism, then reverses the light rays to erect the image at the reticle. The eyepieces magnify the image for the observer to see.

Reticle Scale

The reticle has vertical and horizontal lines. Each small division on both lines represents 5 mils, and each numbered division represents 10 mils. One perigon is equal to 6400 mils.

Body assembly

The binoculars consist of two identical telescopes with the following components:

1. Eyepiece
2. Main binocular body housing the Porroprism assembly
3. Objective lens
4. Connecting shaft
5. Interpupillary scale (56mm~72mm)
6. Diopter adjustment ring with index marks (each graduation = 1 diopter)
7. Rubber fold-down eyecups
8. Compass and Reticle illuminator On/Off switch
9. Battery compartment
10. Dust cover for objective lens
11. Dust cover for eyepieces

How to use the Binoculars

How to focus the binoculars

Interpupillary adjustment

First, adjust the binoculars so that both eyepieces are directly in front of your eyes. Hold the binoculars with both hands and bend the main binocular body housing until you can see one single circular image. Note the scale setting on the interpupillary scale for quicker resetting later.

Rubber fold-down eyecups

These binoculars have long eye relief and are suitable for eyeglass wearers. The rubber fold-down eyecups allow you to see normal images without removing your glasses. Press the eyecups lightly to fold them down easily.

Focusing

To get a clear image, you must focus the binoculars. This model has two individual diopter adjustment rings on each telescope, allowing you to adjust the optics to your individual eyes. Adjust each eyepiece after placing the binoculars to your eyes and viewing an object. Close your left eye and adjust the right eyepiece until the object is in focus. Then, close your right eye and adjust the left eyepiece until the object is in focus.

Binoculars and Accessories

No specific information about binoculars and accessories is provided in the manual extract.

Storage and Maintenance

No specific information about storage and maintenance is provided in the manual extract.

FAQ

Q: Can these binoculars be used in marine environments?

A: Yes, the 10 x 50 Military and Marine Binoculars are designed for marine use and can withstand marine environments.

Q: Can these binoculars be used by eyeglass wearers?

A: Yes, these binoculars have rubber fold-down eyecups that allow eyeglass wearers to use them without removing their glasses.

General Overview

Product Description
These 10×50 binoculars are a floating model with illuminated compass. They have one ranging tool. The eyepiece Mils Reticle Scale can be used to estimate your distance from an object if its size is known, or vice versa. The optics are precision crafted for brightness and clarity of image.

Model 10×50 with compass

Technical Specification

Optical performance

• Magnification: 10x
• Field of view at 10x: (109m/1000m)
• Exit pupil diameter: 5mm
• Exitpupil distance:18.3 mm (Long eyerelief for eyeglass wearers)
• Diopter adjusting range : -5 ~ +5 DIOPTER
• Interpupillary distance: 56 ~ 72mm
• Resolution: ≤ 5″

Size and mass

• Size(length x width x height): 210×90×160mm
• Weight: Binoculars: ≤1.25kg(2.76Ibs)
• Complete product: ≤1.7kg (3.75Ibs)

Construction Specifications

Optical system

Basic binocular construction
Basic binocular optical construction, as shown in figure 1, consist of (1) the objective lens, (2) the Porroprisms, (3) the reticle and (4) the eyepiece. Reticle (3) and the module of compass (5) are built into the right half of the binoculars body.

How Binoculars work
The light from the object or target you are looking at enters the binoculars through the Objective lens system (item 1,fig.1). Due to the objective lens, the rays are converged to an upside down image. Then the light rays of the image passes through the prism system (known as the Porroprism) (item 2, fig.1) and are reversed to erect the image at the reticle (item 3, fig.1). This image is magnified by the eyepieces (item 4, fig.1), so that the observer can now see the distant object.

Reticle Scale (See Fig.3)
There are vertical and horizontal lines on the reticle （fig.3）. Each small division on both vertical and horizontal lines represents 5 mils and each numbered division represents 10 mils（one perigon=6400 mils）. So,“10” on the scale is equal to 10 mils.

Body assembly (Fig.2)
The binoculars consist of two identical telescopes. Each half consists of the following：

1. Eyepiece
2. Main binocular body housing the Porroprism assembly
3. Objective lens
4. Connecting shaft
5. Interpupillary scale（56mm~72mm）
6. Diopter adjustment ring with index marks（each graduation = 1 diopter）
7. Rubber fold-down eyecups
8. Compass and Reticle illuminator On/Off switch
9. Battery compartment
10. Dust cover for objective lens
11. Dust cover for eyepieces

How to use theBinoculars

How to focus the binoculars

Interpupillary adjustment

First adjust the binoculars so that both eyepieces are directly in front of your eyes. This is done by holding the binoculars with both hands and bending the main binocular body housing until you can see one single circular image.
Note： the image will not be clear. You will adjust for clarity in the next step. You must first set the binoculars interpupillary distance to fit your eyes. The setting for your eyes will be indicated on the interpupillary scale （ fig.2,5 ） . Note this scale setting for quicker resetting later.

Rubber fold-down eyecups
These are long eye relief binocular. They allow the eyeglass wearer to see normal images without removing their glasses. These convenient eyecups fold down for use with glasses and fold up for use without glasses. Lightly press eyecups to fold them down easily.

Focusing
In order to get a clear image, you must focus the binoculars. This model has two individual diopter adjustment rings on each telescope so you can adjust the optics to your individual eyes. You will need to  adjust each eyepiece. After placing the binoculars to your eyes andviewing an object, close you left eye. Rotate the right diopter adjustment rings until the object image appears sharp and clear in your right eye. Then open your left eye and close your right eye. Rotate the left diopter adjustment rings until the object image appears sharp and clear in your left eye. If you share your binoculars with another person, note the diopter index mark setting at the base of the eyepieces first（fig.2,6）. Then you can simply return the eyepieces to those settings when you next use the binoculars to view an object at the same distance.

How to use the Mils Reticle to estimate distance

What is View Angel
The view angle of an object is the angle from your binoculars to the edges of the object. It is calculated in mils using the Mils Reticle on your binoculars. Using this measurement you can calculate the distance to an object where the height or width of that object is known. This measurement is taken either horizontally or vertically and known as Horizontal View Angle or Vertical View Angle.

How to calculate the Horizontal View Angle of an object
Where the object fits within the horizontal scale range （ 0~80 mils ）inside the binocular, line one edge of the object up with a point on the horizontal scale line and read the value from where the other edge meets the horizontal scale. In fig.4 the right edge of the sail boat is at zero and the left edge at 20 so the horizontal view angle is 20 mils.（10 on the scale = 10 mils, 20 = 20 mils etc）.

How to calculate View Angle when the object is larger than the scale
When the object is larger than the scale , choose a midpoint, take the view angle of this point and multiply by 2.

How to calculate the Vertical View Angle of an object
Use the same method as outlined in 4.2.2a but use the vertical scale. In fig.5 the base of the light house meets the vertical scale at zero and the top of the lighthouse meets the scale at 40 so the vertical view angle is 40 mils.

How to use your binoculars to estimate distance
The formula for measuring distance is L(km)=H(m)/w(mils)

Where:

• L=the distance between the observer and the object in km
• H=the height of the object in m(this must be a known value)
• w=the view angle of the object measured using the mils reticle on your binoculars (see 4.2.2 and 4.2.3)
• When measuring the distance, first estimate the height of the object, then take the view angle reading on your binoculars and enter both the formula.

For example:

• A light house is 12m. (H=12m)
• The view angle on the binoculars is 40 mils (see fig.6)
• Using the formula L (km) =H (m)/w (mils) we can estimate the distance.
• L=12/40=0.3km (300m)
• Therefore, the distance between the observer and the lighthouse is 300m.

How to use the compass
The azimuth angle can be measured through the compass built into the right half of the body. It shows the azimuth of the object relative to Each graduation of the compass equals one degree. When the object lies to the north, the compass shows 360 °（degrees）. And it will increase when you turn clockwise. 90 ° means the object is located to the east, 180°means south and 270°means west. In order to ensure precise angle measurements, the binoculars should be kept horizontal and level when reading the compass. The object should be in the middle of the reticle. Under the condition of night or darkness, the figures of the compass and the reticle need to be illuminated by pressing the on/off button.

Changing the batteries

• The batteries for the compass will be exhausted if the internal lighting system has been used for long periods. Batteries can also become weak if not used for an extended period of time. If the light becomes dim, open the battery cover and replace with fresh batteries.
• Batteries are included and uninstalled in your binoculars, which is put in the bag, you need to install it first before you use. When it becomes necessary to replace them ， unscrew the battery cover with a coin or screwdriver and replace with the same type. Be sure to install the batteries in the same direction as the originals, with the flat positive（+）side facing up towards the cover on the battery. Screw the battery cover back on tightly and press the illuminator button to test the light. The figures should be visible on the compass location（you may need to cover the right objective lens if you are outside in bright light）.
• Please note：The battery（model：AG9/LR936） should be replaced at the same time. The battery should be taken out if the binoculars will not be used for a long time. Batteries left in the binoculars for extended periods of time without being used may leak and cause damage to the binoculars.

Binoculars and accessories

• 10×50 binoculars 1pc
• Carrying strap 1pc
• Eyepiece cap 1pc
• Lenscleaning cloth 1pc
• Instructions 1copy
• Soft case with carrying strap 1pc
• Objective Lens Cap 2pcs
• Battery 2pcs

Storage and maintenance

Binoculars are a precision optical instrument. They should be carefully handled and maintained in order to keep them in good working order.

General Maintenance

1. Lenses：Always clean the lenses after each use and before you replace the binoculars in the carry case. After each use, brush any dust or lenses. After brushing, gently wipe each of the lenses with the special optical cloth. Never use your fingers to wipe the lenses as body oil will get on the lenses and possibly damage them. Never use anything to wipe your lenses except special optical cloths. Always keep your optical cloth in the binocular case for easy access for cleaning.
2. Although the eyepieces are made to turn for individual eye diopter adjustments, do not turn them beyond the factory set stop. Forcing it beyond this point will damage the eyepiece optics and make the binoculars unworkable.
3. After using, always remember to turn the diopter adjustment to its“0”position to avoid damaging the ocular system.
4. Avoid any extreme shaking or dropping the binoculars. This may damage the internal optics and prisms. Store the binoculars in a dry and well-ventilated place.
5. Viewing the sun can cause permanent eye damage. Do not view the sun with this product or even with the naked eye.
   Never leave your binoculars in a place exposed to direct sunlight.
   This could result in a potential fire hazard.

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