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 .




TASCO MARINE MILITARY BINOCULARS 7X50 USMC 385FT AT 1000 YDS
TASCO MARINE MILITARY BINOCULARS 7X50 USMC 385FT AT 1000 YDS

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Steiner MM750 7x50 Military Marine Binocular 5840
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Steiner Military Marine 8x30 Binoculars
Steiner Military Marine 8x30 Binoculars

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FUJINON Mariner Marine binoculars 7X50 WPC XL
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10x50 Binoculars Marine Navy with Rangefinder Compass Reticle Telescope Hunting
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West Marine Tahiti Waterproof 7x50 Center Focus Binoculars
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Fujinon 7x50 730 Marine Binoculars Rare 1992 Americas Cup Special Edition
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Binoculars 7X50 Marine Military With Rangefinder Compass Waterproof BAK4 Prism
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Bushnell Marine 137500 Binoculars
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