![]() ![]() To provide you with a clear and high-quality image, magnification and aperture work together. Now that is something to consider when buying binoculars, isn’t it? What Does Aperture or Lens Diameter Means and How it Works? If you are viewing an image that is 1000 yards away than by using 10×42 binoculars that image is going to appear only 100 yards away. Let me quote an example to make it really easy for you. Thus, 10×42 simply means that a picture seen through the binocular lens will appear 10 times more magnified or near than original naked eye image. The first number refers to the magnification of the binoculars. The number that comes before x simply means that an image viewed through those binoculars will appear magnified according to that number. Often you will see a binocular name followed by some number like 10×42 or 8×42. You already know that most binoculars include their magnification number in their name on the back of the lens. That is, without a doubt, the main function of binoculars. In other words, binoculars are tools that are used to magnify an image or scene so that we can see it up close. You can also relate this detailed guide to the following types of binoculars if you were looking for other than 10×42 binos.Īsk yourself this: Why do we buy binoculars? The answer is obvious, to see things that are far away and cannot be seen by the naked eye. You can call us for advice or to chat about choosing optics or other birding products.But the question is what does 10×42 mean in binoculars? For binoculars buyers, understanding magnification and how it works is of paramount importance so you are crystal clear when choosing the right binoculars.Īfter doing extensive research I have compiled this guide to help you understand what does 10×42 mean in binoculars? We have hands-on experience with these optics, and we'd like to help you find just the rightĮquipment for your own eyes and hands. © Copyright 2021 Birdwatching Dot Com Birdwatching Dot Com 80 The eye cups can be extended to hold the eyes the correct distance from the eyepiece. For non-glasses wearers?Īnd note that you do not wear glasses, none of this matters to you at all.īinocular with long or short eye relief will work just fine for a person who does not wear glasses. Or select a model with generous eye relief, such as 18 mm. If you're not sure the binocular has long enough eye relief for your glasses, it's best to try it in person. ![]() There are slightly different ways of measuring eye relief, with differing results. Manufacturer publish the eye relief in the specifications of each binocular,īut you can't always rely on the numbers absolutely. What you're trying to determine is whether the image includesĮverything with your glasses on that you can see with your glasses off. Never mind if you can't focus without your glasses. Look through it with your glasses on and with your glasses off. Most glasses wearers, however, need longer eye relief than that. You might get away with a binocular whose eye relief is only 15mm. If your glasses are small and they ride close to your eyes, However, exactly how much eye relief you need depends on your glasses and your face. Most glasses wearers need binoculars with a minimum of about 16mm of eye relief. Without keeping your eyes too far from the binocular's eyepieces. But if you wear glasses, you need binoculars with long eye relief. Long eye reliefīinoculars come with eyecups that you can pull or turn to make the eye relief shorter or longer, to work with your eyes and glasses. It's like you've paid for a box seat but ended up watching the game through a hole in the fence. The farther away your eye is, the smaller portion of the picture you see. Instead you'll see only the center of the image. If your glasses won't let you get your eye get close enough, you'llĪnd that nearby Great Blue Heron won't fill your field of view. If you wear glasses, the eyeglasses keep your eyes farther away from the glass.īut you still have to get your eyes at the right distance. If you eye is too far away, the image will be constricted. If your eye is too close, you get weird shadows coming in from the sides. In order to see the whole picture, you need to locate your eye at that distance from the eyepiece of the binocular. The thing is, every binocular is made so that there is an ideal distance from your eye to the glass of the eyepiece.Įach binocular has a particular eye relief, depending on the optical design.Įach binocular has a certain eye relief. If the binocular's eye relief is too short, they see only the center of the picture.Īll that good stuff around the edges is obscured. People who wear glasses sometimes get cheated out of part of the image. By Michael and Diane Porter (2021) Missing something? ![]()
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