![]() ![]() The second focal length is that of the eyepiece. More precisely, look for the technical specifications of the particular model. Another source may be the manufacturer’s website. BINOCULAR MAGNIFICATION CHART MANUALThat’s why you should check the user manual to find this number. Unfortunately, you can’t find it anywhere on the actual model. The first one is the binocular tube’s focal length. 26 millimeters in the first example.įor the mathematical part, you’ll need two focal lengths. The second number is the size of the objective lens. ![]() The first set of digits is the magnification power. For instance, 10x26, 16x25, 8x20 and many others. That’s right, you’ll find something that looks like a number times another number. One way to calculate the magnification is by analyzing the eyepieces. How much you see through them depends on that. If you want to use your binos properly, you need to know their magnification power. In fact, these two pieces of information are embedded in the binoculars, themselves. They are known to influence the purchasing decision. Source: Īs many experts for binoculars may confirm, the magnification and the size of the objective lens are the two defining factors when buying binos. Choosing the Right Binoculars, more info on technical properties and different types of binoculars.Calculate the Binoculars Magnification. I've added a page of definitions of terms for binoculars. It's easier to keep the little rascals in sight when the angle of view is larger.Īs I continue my research I will post the topic as I figure them out. The bottom pair is not so bright but has a very useful wide view, I use it for birdwatching. The 50 mm means it gives me quite a lot of light. The top binocular is the pair I use for watching the sky and looking for comets and other wonders. To get the angle in degrees, just divide the number of feet, in this case 578 by 52.5 to get a bit more than 11 degrees. This refers to how wide a diameter you can see at 1000 yards. Sometimes the field of view explained by giving feet over 1000 yards. It is the same as saying 373 feet at 1000 yards. It's a slice of 360 degrees which would be a complete view all around if that was possible. This is the field of view, the actual angle you see. In this particular binocular, there is a third number, 7.1. That is why astronomy instruments are large, to gather the most light possible. This is usually not very relevant if you only plan to use your binoculars during the day, but if you will be viewing at night then it is very important. The larger the objective the more light can get in the binoculars and the brighter the image will appear. In this case the objective is 50 mm across. The second number refers to the size of the objective in mm. So a 7 x 50 binocular magnifies an image 7 times so that when you look in the eyepiece you see the object as though it were 1/7 of the distance it actually is. ![]() The bigger the number the greater the magnification. The first number refers to the amount of magnification. The Objective gathers the image in the form of light while the ocular magnifies the image and sends it to your eyes. An ocular, the small one by your eye, and an objective, the bigger one that you point at the object you want to see. First, What do the Numbers Mean?īinoculars at their most basic are made of 2 lens. I was wondering also why the huge price difference between cheap binoculars and more expensive ones. These pages are a result of my trying to figure all this out. Have you ever wondered what the numbers mean on binoculars, or what makes one binocular better than another, or why one binocular is better than another for a boat but terrible for astronomy. ![]()
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