[kraigwy]

I believe, (would have to see it for sure) that the marks are in Mils. With that you can estimate range. A mil is a mil whether its 10 yards (or meters) or 10,000 yards (or meters).

Mils are used in Artillery and Machine Guns, (and now rifle scopes).

A mil is that angle whose tangent is 1/1000, that is the angle sutended by 1 unit at a distance of 1000 units. 1 yard at 1000 yards, or 1 foot at 1000 feet.

You can test this by getting a piece of string 20 inches long, tied to a target 1 inch wide. Hold one end of the string in your mouth and hold the other or pencil out. The range is 20 inches. The one inch target would be 50 mils.

So M or Mil = 1000*1/20 so M or mils = 50.

As a side note: Remember in basic we were taught to use fingers to estimate range. The average finger is 50 mils. You should also use your finger to cover an object. Looking at that object through your field glasses should measure 50 Mils.



Lets change this to a 1 yard target at 100 yards.

1000 * 1 / 100 = 10 so the 1 yard target would be 10 mils.

Knowing that, you can go the othe way. Lets say your 1 yard target is 10 mils. Range would be 1000*Target / Mils.

or 1000*1 yard / mils + range to the target. 1000*1/10 = 1000

Like any other math, if you know two of the 3, you can find the third.

Knowing this, you can play with your field glass and I'm sure you'll find out the marks are mils.