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I know what, I just don't know how.

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/12/2010 at 02:35
JiminTexas View Drop Down
Optics GrassHopper
Optics GrassHopper

Joined: June/12/2010
Location: San Antonio
Status: Offline
Points: 1
I have a pair of Steiner Military and Marine 8x30 binoculars that are Israeli military surplus. On the right lens there are markings. I am told that they are range finding markings but they seem to designate angles, I assume in minutes of angle, but there are no numbers, just small vertical marks that are spaced regularly across the field of view. Does anyone out there know how these markings are used? can they be used to measure or estimate distances?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2010 at 11:41
tamanoir View Drop Down
Optics GrassHopper
Optics GrassHopper

Joined: June/25/2010
Location: France
Status: Offline
Points: 25
Hello !
I didn't verify this specific model, but chance are the scales are in milliradians, read 1/1000 radians.
If it is, it's very easy to use, even for user accustomized with British units ! (I read elsewhere that even some US commandos now uses milliradians for their new rifle scopes).
A dirty definition of milliradian :
x milliradians angle height  correspond to x (unit) linear height seen at 1000 (unit).
Height (unit) / Distance (unit) = R radians
1000 . Height (unit) / Distance (unit) = MR milliRadians

Examples :
3 meters seen at 1000 meters ==> 3 milliRad
2.5 yards seen at 100 yards ==> 25 milliRad
2 m seen at 400 m ==> 5 milliRad

To verify milliRad (or not, such MOA) : look at something 1 yard height (90 cm) at 100 yards (90 m) : if it covers 10 graduations, you are in milliRad, otherwise chance it is in MOA (and then you can rebuild the formula, just knowing H/D ~ tg(angle°) and 1 MOA = 1/60°. If in MOA, the 1 yard seen at 100 yards would be 34,4 MOA)

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