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What To Know When Buying BinocularsChuck Fitzgerald We are asked nearly every day: "What are your best binoculars" And every day we answer: "How do you plan on using them" We are not trying to be evasive with our answer, but the truth of the matter is – the best binoculars for one purpose may be the worse binoculars for another. We want you to Get It Right The First Time. Understanding your application is paramount in determining the best fit – for you. Although there are many other specifications and qualities which determine the usefulness of binoculars, we will discuss in this article the primary characteristics for determining the best fit for your application. But before we show you the list, we should go over some basic terminology. What do the numbers on binoculars mean All sporting optics binoculars, spotting scopes, night vision goggles, etc. use the same nomenclature to describe important features. As an example, a pair of binoculars may have 10x42mm listed as a technical specification. But what does this mean The "10" refers to the magnification power of the binoculars – that is – objects viewed will appear to be 10 times closer than when they are viewed by the naked eye. The second number in our example is "42mm." This refers to the diameter, in millimeters, of the objective lenses on the binoculars. The objective lenses are located on the end of the binoculars furthest away from your eye when viewing. As with the aperture of a camera lens, the size of objective lens determines the amount of light that can enter your binoculars. If your binoculars are going to be used during low light hunting and astronomy are good examples you had better have large objective lenses. Another important number describing binoculars is called field-of-view. A field-of-view of 390 indicates that the width of the sight picture is 390 feet at a distance of 1000 yards. Field-of-view is determined by magnification and the focal lengths of the objective and eyepiece lenses. More magnification always means less field-of-view. This specification is sometimes expressed in degrees. A field-of-view of 6.5 degrees equates to 341 6.5 times 52.5 equals 341. How well your binoculars will serve you in low light conditions is described as Twilight Performance. Although many things, such as overall design and quality of glass impact this specification, magnification and objective lens diameter are the chief components. A quick way to determine the Twilight Performance of binoculars is to multiply the magnification power first number times the objective lens diameter second number. The higher the result, the better the Twilight Performance. As an example, 10x42mm binoculars will have better Twilight Performance than 8x50mm binoculars 420 versus 400. Now that we understand some basic terminology, here is “What to Know When Buying Binoculars."
Your understanding of these few simple tips will not only help you in acquiring the correct binoculars for your application, but they will also help you with successful viewing – no matter what you’re looking at. Use this information and you’ll Get It Right The First Time. Get Outdoors!
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