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The 10x means it magnifies ten times

The 70mm means the final lenses (that point to the image) are 70mm in diameter.

The larger the diameter, the more light that can enter the binoculars and so the easier it is to see the image. So binoculars 10x50mm and 10x70mm both magnify ten times, but the 70mm diameter lenses allow more light in and so should give a better image.

So the larger the second number, the better the image [should be] for a given magnification; however, the larger the second number the larger (and heavier) binoculars become.

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14y ago

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