Originally posted by sulhan
just to share,
A bino specs is read this way:
8 X 50 = 8 times magnification and the main lens is 50mm in diameter
so if you have 50x 75 = its 50 times magnification and diameter is 75mm.
The largwer the diameter = more light to enter = will be able to see more dim stars etc....
FYI,
Regards,
me