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The 8 is the magnification lens and 42 is objective lens diameter.
Sorry, there was a problem. Please try again later.8 means something looks 8 times bigger. Look at something 40 meters away, it will be as large as if you were 5 meters away. 42 means how bright the image will be, compared to say 8x30, nearly twice as bright. Better if looking at bird buried back in a tree, less important for sports.
Sorry, there was a problem. Please try again later.the 8 is magnification (x) the 42 is objective diameter (mm)
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