Basic Specs First, a brief definition of the basic specification for any binocular, e.g. 8 x 40, or 8 by 40, is in order. The first number is the magnification power of the binocular. It will make an object appear that many times larger than the naked eye. So, an 8 power binocular magnifies an image 8 times. The second number is the diameter of the larger, or objective lens in millimeters. This is the lens that gathers in the image of the object you re looking at. So, an 8 by 40 binocular has a 40 millimeter objective lens. The larger this lens size, the larger the binocular body. This can be a factor if you can t carry around something very heavy for several hours outside.
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