For example, a binocular that is listed as 10-22x50mm means the zoom portion is capable of viewing at 10x power minimum and can be adjusted up to 22x power and the 50mm would be the objective lens size ( the larger lenses at the opposite end of the binocular ). Zoom Binoculars work on the same principle as regular binoculars except that the power can be adjusted to give you varying ranges of magnification. However, binoculars with smaller lenses are more compact and portable. The higher the number, the larger the lens in effect allowing more light to pass through thereby projecting a brighter image and viewing experience. The size of the objective lens will determine how much light the binocular can obtain for effective viewing. What do the Numbers mean?īinoculars are often specified by a set of numbers such as 7×35 or 8×40, the first number indicates the strength of magnification (how many times closer the subject is to you, 5 times closer, 7 times closer, 10 times closer) and the second number is the size of the objective lens measured in millimeters going across the lens. Generally eyeglass wearers will keep the eyecups down which will bring your eyes closer to the lenses improving your view. Some models use rubber eyepieces that fold down while some may use twist up/down or pull up/down. PLEASE NOTE that some binoculars do employ different focusing mechanisms so please read the user manual included in your purchase.Įyecups are designed to exclude any additional stray light that may interfere with the eyepieces during use. No further adjustment will be necessary except for the center focus wheel. Your right side diopter setting is now fixed to your preferences. When the image is clear, you can now open both eyes and use ONLY the center focus wheel to make adjustments. Looking at the same target, adjust the right side diopter ONLY on the right eyepiece (DO NOT use the center focus wheel) until the image is clear. Once clear, close your left eye and open your right eye. While looking through the binoculars at a stationary target about 30-50 feet away, close your right eye and focus using the center wheel until the image is clear for your left eye. Most Binoculars have a center focus wheel and a right eye diopter adjustment near the eyepiece to account for the small difference in the strength of each eye. The result is a binocular that can be made smaller and more powerful.įocusing Your Binoculars. Many binoculars today utilize prisms which bend the light as it enters the objective lens and helps to magnify the image as it passes through the frame. More often than not prisms are utilized in the process as well which bend and reflect the light entering the objective lens. The downside to this is that each time this occurs some light is lost. This process occurs by utilizing curved glass lenses and multiple lenses within the frame to magnify the subject each time it passes through to the next lens. What are Binoculars and how do they work?īinoculars, in its simplest definition, are magnification instruments that are made up of two telescopes mounted on a metal or plastic frame so that a viewer can view images as if they were much closer.
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