To clear up some misconception here....
first number is the Magnification.
Second number is diameter of objective lens. (in simpler terms. the
lens that controls the light into the bino body, the lens does not
control per se, but it is the diameter that does)
Angle of view has nothing to do with these 2 number (but co-related
to the magnification). In general, the higher the magnification,
the narrower the angle of view.
But a X brand 10x30's angle may be different to Y brand
10x30.
This is because they have different lens construction and
engineering.
If you want to see the angle of view, you will need to see the
technical literature.
A bigger objective lens simply let more light into the bino body,
the image you see is brighter, colours are richer too.
Don't get too high magnification for a small bino. It means a
little shake in your hands the image movement you see is
exaggerated.... makes you dizzy fast.
