What do the numbers on my scope mean?
Binoculars and telescopes are usually marked with a set of two numbers separated by a 'x'; 8 x 20, 8 x 30, 8 x 40, 10 x 50, 30 x 80, and so on.
The first figure indicates the degree of lens magnification
and the second, the diameter of the objective
lenses, in millimeters.
See also:- What do the numbers on my scope mean?- What is magnification?- What is the field of view- What is an objective lens?- What is eye relief?- What is the exit pupil?- Twilight Factor- Relative Brightness