Marine Binoculars

How do you calculate distance with the use of binoculars?

are there any mathematical equations to determine the distance of something? I was curious about it, because I thought Marine Recon did this by themselves, just in their heads, with a piece of paper.
How can I calculate (mathematically), the distance between me and something about 1/3 mile away from me?
THE RANGE OF AN OBJECT**

binoculars are adjustable , they can be adjusted so that you can see what you want more clearly .

binoculars uses 1 or 2 type of lenses : biconvex and biconcave , those lenses have what we call focal point , using the binocular settings for best image and the binocular specification with a good knowledge of lenses equations , you can determine exactly how far is you target , with more practise you can do it with no calculations .

see my sources for detailed information on lenses and binoculars .




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