The down side to the larger diameter is that it also means a larger (and often heavier) binocular. the 42 in 8×42) is important because the larger the diameter of the objective lens, the more light will be let in – letting you see more in low light conditions, such as dawn and dusk, as well as giving you more light in general to get more clarity and sharpness on your subject.
Typically between 7x-10x is great for going out into the field for general nature watching and birding. Too little magifiction and you may as well forget using binoculars, too much magnification and the shake of your hands will be too great to be able to enjoy yourself. So what does all this mean? Well with magnification there is a sweet spot. Just turn your binoculars around and measure the end that is furthest from where you look through – the number you get will be the same as the second number that your binos are rated as. So if you have a metric ruler, you can check this out. The second number is the diameter of the objective lens (the far end of the barrell, not the end you look through) measured in millimeters. So if it says 8×42 then it means that the object (or bird or butterfly) will seem 8 times closer to you when you look through the binoculars.
You know the numbers….the 8×42, 10×32, that are printed on the binoculars….so what do they mean? Well, here we are to demystify the numbers.
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