Hi
What does the first number mean with binoculars? Such as 15X80. The 80 means each individual main lense measures 80mm acroos, right? What does the 15 mean? Is it the focal length? If not, how do you figure the focal length? Why do binos cost so much less than 2 refractor telescopes of the same aperature? I am thinking of buying a pair for astronomy, but first I need some infomation about them.
Thanks,
Doug
What does the first number mean with binoculars? Such as 15X80. The 80 means each individual main lense measures 80mm acroos, right? What does the 15 mean? Is it the focal length? If not, how do you figure the focal length? Why do binos cost so much less than 2 refractor telescopes of the same aperature? I am thinking of buying a pair for astronomy, but first I need some infomation about them.
Thanks,
Doug
