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Usually the first number is the magnification (in this case 30X) and if it has a zoom from 10X to 30X it would look like 10 - 30X25. The second number is the objective diameter (in mm) of the binocular. The larger the diameter usually means more light is let in and more field of view. 8X42 for example has an 8 times magnification with an objective diameter of 42mm for each side (each monocular).

The DCF is a way of describing a roof shape of the internal prism binocular. It means "Dach Centre Focus" (Dach is German for roof).

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