5/30/2023 0 Comments Binocular numbers meaning![]() You want to be sure you’re buying a binocular model that will fit. This is a great consideration for persons that wear glasses. In most binoculars, eye relief varies from 5mm to 20mm. This is the distance between the eyes and the lens. Exit pupil is basically the lens diameter divided by the magnification.įor example, a 12X50mm binocular will have an exit pupil of 4.5.Ī 4.5mm exit pupil reading is the best guaranteeing excellent daytime and low light binocular views. Output PupilĮxit pupil is expressed in millimeters and makes another consideration. It’s expressed in degrees and meters.Ī small magnification will have a bigger field of view than a larger magnification. This is the area one observes through the binocular at 1000m. Other factors to consider when choosing a binocularĪpart from the numbers on the binoculars which show the magnification and objective lens, there are a few things to consider when choosing a new binocular. But you also need to learn a few crucial features before making any purchase. The second binocular will also have a wider field of view.īut we need a tripod case in the 12X52mm binocular to have a better view.Īre those the only features to consider? Knowing what the numbers on a binocular mean is important. On the objective size, the first binocular with 42mm will collect less light than the 5mm objective lens. The first binocular will show images 10 times larger while the second will show images 12 times larger. The second binocular has a magnification of 12X and an objective lens of 52mm. To have a better understanding of the meaning of the numbers on a binocular, let’s dig deep and see the two examples.Ī 10X42mm binocular is one with a 10X magnification and an objective lens of 42mm. Difference between a 10X42mm and a 12X52mm binocular But for daylight trekking, a lens diameter of 20mm works just fine. ![]() If you’re observing at night, or when light conditions are low, then a 50mm lens diameter is okay. Such binoculars are pretty lightweight and extremely easy to carry. The ideal weight binoculars should be those with 50mm lens diameter or less. Weight is a great consideration for birding, travel and other outdoor activities. Larger lenses simply means the binoculars will be heavier. Generally, a larger lens diameter equals more brightness and visible lights. If you’re planning to use binoculars at sunset and sunrise, then consider one that allows more light to pass to the lens. Lens diameter is an important feature to consider when buying a new binocular. The diameter is expressed in millimeters and determines the amount of light passing through to the lens.Īdditionally, the lens diameter affects the size of the field of view. It is the diameter of the objective lens. The lens diameter is the second number after the X. ![]() A bigger magnification is only needed when you want fine details. Generally, binoculars with 10X magnification or more require a tripod stand to ensure better clarity and detailed observations.Ĭhoose a lower magnification when you’re not after fewer details on the frame. The situation can become worse with a larger magnification. When using binoculars, hand vibrations can make the framed space unclear. Greater magnifications however mean a lower angle of view.Īre you seeing a bigger image in the eyes? Then it means the angle of view is narrow. The higher the number, the bigger the magnification. It’s a number that indicates the number of times the image will appear close. Magnification in a binocularĪs indicated earlier, magnification is the first number on the binocular. Let’s break this down in detail by looking at the magnification and objective lens size in detail. But a 10×52 binocular will be bulkier and larger. However, it also means a bigger and bulkier binocular.įor instance, a 10×52 binocular reading will have more light in lowlight conditions than a 10×42 binocular. A larger objective lens means more light passing through and more clear images. ![]() The diameter of the objective lens is what gathers the light that illuminates the image. The objective lens on this case is 50mm.ĥ0mm is the diameter of the objective lens. A 12x by 50mm binocular will magnify the image 12 times. The second number is the objective lens size and is usually shown in millimeters.Ī magnification number tells you how many times the image will appear bigger. It shows you’ll see the image size 10 times. The 10 in the example above is the magnification and read as 10X. Let’s have an example of the most common magnification and objective lens size. Magnification number and objective size number are shown by two numbers separated by an X. The numbers on a binocular simply stand for the magnification and the size of the objective lens. Other factors to consider when choosing a binocular.Difference between a 10X42mm and a 12X52mm binocular. ![]()
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