Frequently Asked Questions

Why binoculars are important and interesting for us?


Binoculars are a unique invention of mankind for large and small discoveries. With their help, people can understand the world around. Someone knows the beauty of the arts in the theaters, and scientists open new stars. Travelers use binoculars for traveling and discovering new places, and naturalists use it for learning nature.




What we should know about numbers on binoculars housings, for example - 10x42


These figures show to any person how many times the binocular increases the object and diameter of a particular lens. For example, the figure 10 indicates an increase in the object by a factor of 10. And the second figure is that the diameter of the lens is 42 mm.




Is there a difference between the images BAK4 and BK-7 prisms?


Since the objective lenses form images that are both upside-down and reversed left-for-right, prisms are required to invent the primary image. Most commonly, binoculars utilize either Porro prisms or roof prisms for this purpose. Porro prisms give binoculars their familiar zig-zag profile, while roof prisms permit a straight-line design. Either type of prism could be designed BK-7 or BAK-4. BAK4 prisms (barium crown glass) are the highest quality available. BK-7 prisms (borosilicate glass) are also good quality, but brightness falls off slightly at the edge of the field compared to BAK4. It is very important that all ZoomX binoculars have BAK4 prisms.




Is «Lens Coating» so important part in the structure of binoculars?


It is important to know that an average uncoated lens can miss only 90% of the light. The remaining 10% is simply reflected. This fact greatly affects the quality of the image that we see. Standard coatings of magnesium fluoride applied to the lens and prism surfaces reduce the level of reflected light to about 4% and thus the vague image of bright objects becomes more distinct. Contemporary, complex in structure coatings make it possible to pass almost all the light that hits the surface of the lens(to 99%). Physicists went further in their discoveries and invented a ruby coating. This breakthrough helps protect the eyes from ultraviolet radiation. Terms and their abbreviated meaning that will help you deal with lens coating. Coated (C) - One or more surfaces are coated. Fully-Coated (FC) - All air-to-glass surfaces are coated but plastic lenses may not be. Multi-Coated (MC) - One or more surfaces are coated. Fully Multi-Coated (FMC) - All air-to-glass surfaces are coated.




Full coverage or not full coverage of lenses? - important questions for users.


Binoculars with Multi-coated and fully multi-coated optics have also have a difference in quality. For a high-quality and contrasting image, it is important that a special coating is not only on the top of the lens. The inner part of the lens «glass-to-air» it can also be coated with a special layer. The price of binoculars with a similar coating is much higher, but the quality of the product is significantly increased. Note: All ZoomX binoculars are fully multi-coated.




What is «Exit Pupil Diameter»?


This is the diameter of the shaft of light coming from the binocular eyepieces to your eye. It’s easy to calculate this based on the objective size and the magnification. Exit pupil diameter equals objective size divided by magnification. So for a 10x42mm binocular, the exit pupil diameter would be about 4.2mm. A larger exit pupil diameter is generally more desirable- especially so when binoculars are used for astronomy, since our eyes dilate in darkness. The wider the shaft of light, the brighter the image will be because the light is hitting more of our retina. A binocular that has too much magnification for it’s objective size will have a darker view, because a narrower shaft of light is reaching a smaller amount of retina.




What is «eye relief» (also called «Exit Pupil Distance»)?


Eye relief, also known as exit pupil distance, is the distance your eye should be from the ocular (eyepiece) for optimum performance. Eye relief generally decreases as power increases. Low eye relief (less than 10mm) requires you to get very close to the eyepieces, while higher eye relief (greater than 15mm) allows more distance.




What should do people who wear glasses?


Modern technologies allow people with visual problems not to worry about many things that relate to the image of the surrounding world. Correctly selected binoculars, with the necessary diopter can provide a corrective effect, as well as glasses.




How do I use the dioptre to focus my binoculars?


Everybody's eyes are different and each eye may not be in perfect sync with the other, so getting your binoculars to match your eyes is vital and very simple to do. First of all, cover the right side objective lens and using the central focus wheel, focus on an object at a median distance (between close focus and infinity) to suit your left eye. Once focused, uncover the right objective lens and cover the left side. Now, using the dioptre adjustment (often found next to the right eye piece or attached to the central focus wheel), ensure the picture is focused to suit your right eye. During the diopter adjustment, be sure not to move where you are standing or change the focus on the central wheel. Now each barrel will be fully focused to your eyes!




Cleanliness is the key to long and productive use of any product. The rules of care for binoculars.


The binoculars are a daily use item, but it has special care features. Lenses should not be subjected to frequent rubbing and strong friction. Matrix Microfiber is suitable for care. Wipe in a light, circular motion without strong pressure. Such care will allow the binoculars to last a long time.




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