Binocular in Bangladesh | AjkerDeal.com
Binoculars are a type of hand-held telescope. Used to view objects that are far away from normal vision. It is also possible to see almost invisible objects in the distance a few feet in front. It has different values from which its distance redemption ability is understood. It is called binocular because it can be used with two eyes. If the same device is suitable for one eye, it is called monocular.
Binocular-Monocular-Telescope
Binoculars are usually used to view moving objects. At the same time monoculars are also used. For example - watching flying birds, watching games sitting on the stadium, watching flying planes. The range of binoculars is usually 1000 yards or 0.9144 kilometers or 3000 feet. The range of the monocular is a little longer.
Telescopes are used to see the moon, distant planets, stars or distant stationary objects. There are some types of telescopes. Galilean, neutron and complex or compound telescopes. Galilean and neutron telescopes are usually good for amateur sky viewing or small bed research. These are relatively light, easy to transport and relatively inexpensive. Complex or compound telescopes are used for research. It is relatively heavy and dull.
Brief History of Binoculars
The first telescope was made by Hans Lippershey in 1608 and opened up a world of possibilities for human sight. But this was just the start.
Then in 1609 Galileo built a telescope to see the stars. Interestingly, Galileo got the idea to make this telescope from a spectacles seller. The spectacle seller noticed that the front barometer was larger in size than the static lens installed in his shop.
Galileo observed Saturn's ring and Jupiter's satellites with his telescope. Then in 1611 Kepler built a fairly modern astronomical telescope.
Early binoculars
Humans have two eyes, whereas telescopes can only be viewed with one. So naturally J.P. Lemiere, a French inventor decided to put two small telescopes together and create the first pair of functional binoculars in 1825 and first patent was applied. However, it took another 29 years for the Porro prism system that we use today to be developed and put into service. Modern binoculars began with this invention.
Magnification Powers of Binoculars
The magnification of a telescope or binocular is called its optical parameter. A pair of digits describe the magnification of all binoculars. When you go to buy a binocular, you will see that it says 10x25 or 8x40 or many more. These mean the power of binoculars. Suppose this number 10 means that the object seen with this binocular can be brought 10 times closer. And the number 25 indicates the diameter of the front lens. The larger the size of the front lens, the brighter the object seen through it. If you buy a telescope again, you can see that it has 50 mm, 75 mm, 100 mm. Is written. This means the lens size of this telescope. Telescope lenses may be larger than this. A few more things written on the telescope are focal lengths 350 mm, 800 mm. The higher the focal length, the better the distant object can be seen.
Binocular Parts and Their Functions
Basically Binocular consists of below-mentioned components;
a. The light emitted by the distant object is caught by the objective lens.
b. Prism (Porro & Roof Prism Type)-Corrects the inverted Image through the lenses to the original position of the object
c. The final image is shown to the eyes through the eyepiece/ocular lens.
d. Casing/Binoculars Barrel– Provides a protective covering and connects the various binocular pieces.
e. Diopter– Different eye sights can be customized for viewing.
f. Focus Wheel– The binoculars' focus can be adjusted for objects at various distances using the focus wheel.
How Binoculars Work?
Binoculars actually help us see by using the reflection of light. We know that when light is reflected from an object and falls on our eyes, we see that object.
Again the light is easily reflected by hitting the glassy material. The binoculars where the eyes are kept have two lenses called Eyepiece lenses. Then there are two pairs of prisms inside the telescope called Porro Prism. There is an Objective Lens at the very end. When we try to see an object through binoculars, light is reflected from that object and enters the objective lens and magnifies.
However, when it comes to the objective lens, the image of the object is bent at a 90 ° angle. The curved image then enters the Porro Prism, and the function of these two prisms is to bend the image 180 দেখ to show it at right angles. From the prism the image then enters the viewer's eye through the Eyepiece Lens.
The magnification of a telescope is called its optical parameter. If the optical parameter of a telescope is 7, then that telescope is able to magnify any object 6 times. The optical parameter is written on the telescope which shows the power of the telescope.
There is a a key in the middle to adjust the focus of the telescopic lens. Turning the key causes the two lenses to move back and forth, adjusting the focus to the viewer's convenience. Those who have eye problems can use binoculars without glasses to adjust the focus of the binoculars. Sophisticated binoculars have the opportunity to zoom in and see objects from far away.
Advice on buying binocular
Small size binoculars or monocular will be good for general use. And those who want to see things like birds or distant mountains will need medium-sized telescopes or binoculars with large lenses.
Those who want to watch the game sitting in the stadium can use more low-capacity field view telescopes or binoculars or monoculars.
Those who want to see the planets and stars in the night sky will need the largest or more powerful telescope. But if you want to see the moon, you can use a small telescope. If you want to see galaxies, nebulae or other stars, you can see them with a medium-sized telescope, if the sky is cloudless and the light is not polluted. And if you want to see the ring of Saturn or Mars, you can see better from the lens of 75 mm diameter in the lens above it. Use IPx with 20x or above.
As Bangladesh is a moisture prone country, none of the telescope binocular monocular cameras are safe in this country. So before you buy, find out whether the telescope binocular monocular you are buying is moisture resistant. Moisture resistant telescopes tend to be a little more expensive than binocular monoculars. If it is not possible to buy these telescopic binocular monoculars at a higher price, use them carefully in the rainy season and take special care.
Ajkerdeal.com, one of the earliest e-commerce sites in Bangladesh has a huge collection of different types of binoculars and monoculars at a reasonable price. Browse the large inventory to find the magnification tool you need.