Binocular numbers1/7/2024 ![]() ![]() The larger the diameter of the objective lens, the more light the binoculars are able to gather. ![]() This is simply the width of the lens that you're not looking through! Other fixed magnifications are available (6x, 7x, 12x etc) and zoom binoculars (10-40x) are also available, 8x and 10x offer the best all round performance. You need to decide whether the extra reach of the 10x outweighs the larger field of view (see below) and extra light gathered by the 8x. 8x and 10x are the two most popular magnifications,īut it is important to try the different magnifications before you choose as each individual will have different preferences. The image below shows a Buzzard without binoculars, then what you see with 8x magnification and finally with 10x.Īlthough higher magnification binoculars have their obvious advantages, generally they let in less light therefore producing a slightly duller image. Below I will explain further what these terms mean. A pair of binoculars might also list their field of view. Using the two figures, you can calculate the exit pupil (how much light the binoculars can gather). The first figure is used to describe the magnification and the second is the objective lens diameter measured in mm. How do I use the dioptre to focus my binoculars?Īfter the model name of a pair of binoculars often comes a set of numbers such as 8x25 or 10x42.What do the numbers on binoculars mean?.Frequently Asked Questions about Binoculars
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