Binoculars are optical instruments that allow a person to see distant objects more clearly, and binoculars functions based on two specific number located on the side of the binoculars. These two numbers represents the magnification power and the objective lens size. The first number tells you how much closer a subject will appear to your eyes, and the second number tells you how much light the objective lens will collect from the environment.
You must understand these two numbers because the relationship between the magnification power and the objective lens size determine how bright and how steady the image will be. If you divide the magnification power by the objective lens size, you will calculate an exit pupil. The exit pupil is a measurement of the brightness of the image that reaches your eyes.
What the Numbers on Binoculars Mean
A larger exit pupil mean the binoculars will produce a brighter image, and a larger exit pupil is very important when you are using binoculars in low light condition. For example, when the sun is setting or when it is dawn, your eyes dilate to let in more light, so you need binoculars with a large exit pupil to see clear. A person should look for an exit pupil that is 5mm or larger if the person wants to see clearly in dim light, but a person will find that a smaller exit pupil make the image look dim.
Magnification power affects how much a subject is magnified, but higher magnification power also make the image more difficult to hold steady. If you use a high magnification power, your hand tremors will appear larger in the view, and high magnification power also narrows your field of view. For example, if you are scanning a crowd or tracking fast movement, you should use a magnification power of 6 or 7 because a magnification power of 6 or 7 provides a wider field of view and more stability.
If you are engaging in daytime activity, a magnification power of 8 is often a good balance because a magnification power of 8 provides detail while maintaining a wide enough view to follow subjects. If you use a magnification power of 10, you will see more detail, but you will also notice more shaking in the image. If you use a magnification power higher than 12, you will likely need to use a tripod because the image will shake too much to be useful without a tripod.
Objective lens size affect how much light the binoculars collect, but larger objective lenses make the binoculars heavier and larger. Small objective lenses, such as 25mm lens, are easy to carry in a pocket, but 25mm lenses do not collect much light and will produce dim images after the sun sets. If you want binoculars that can be used all day, you should use 32mm or 42mm objective lenses because 32mm or 42mm objective lenses collect enough light for clear images without being too heavy.
If you are using binoculars on the water or at night, you should use objective lenses that are 50mm or larger because 50mm or larger objective lenses collect the most light, even though 50mm or larger objective lenses is heavier to carry. Prisms are the internal component that shape the binoculars, and different prism designs change how the binoculars feel and function. Some binoculars use offset barrels which is bulky, but offset barrels can provide a sense of depth.
Other binoculars use straight designs which are sleeker and easier to pack, but straight designs may cost more money. Additionally, manufacturers apply lens coatings to the glass to reduce glare and increase light transmission. High-quality coatings allow more light to pass through the lenses, so high-quality coatings make the colors appear more vividly and the contrast appear sharper.
You should match your binoculars to your specific activity because different activities require different specification. Birdwatchers need a wide field of view so that birdwatchers can follow birds that move quickly. Hunters need enough magnification to see distant targets and enough light to see during hunting hours.
Boaters need binoculars that is stable and that collect alot of light for use on the water. Hikers should choose binoculars that are lightweight so that hikers dont carry too much weight. When you buy binoculars, you must avoid the mistake of choosing only the highest magnification power.
If you choose a very high magnification power without considering your hand stability, you will find that the image shakes too much to see anything. You should also check the eye relief of the binoculars if you wear glasses, because if the eye relief is too short, the edges of the image will appear black. Finally, you should look for binoculars that have waterproof seal and extra-low dispersion glass, because waterproof seals prevent fog from entering the binoculars and extra-low dispersion glass prevent color errors in the image.
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