What does 10X25 means with binoculars?

Answer 1

The first number specifies the amount of magnification (10 times in this case) and the second number(25) has to do with the amount of light the binocular takes in, measured in mm

Answer 2

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).

Answer 3

10X25 on binoculars means the magnification power is 10 times closer than the naked eye, and the objective lens diameter is 25mm. The larger the first number, the more magnification it provides, while the second number represents the size of the objective lens.

Answer 4

10x means 10-times linear magnification, and 25 means a 25-mm object lens at the top of the telescope.