Subtensions at different distances Milliradian

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illustration of sight adjustment 0.1 milliradian increment.


subtension refers length between 2 points on target, , given in either centimeters, millimeters or inches. since mil angular measurement, subtension covered given angle (angular distance or angular diameter) increases viewing distance target. instance same angle of 0.1 mil subtend 1 cm @ 100 meters, 2 cm @ 200 meters, etc., or 0.36 inches @ 100 m, 0.72 inches @ 200 m, etc.


subtensions in mil based optics particularly useful target sizes , shooting distances in metric units. common scope adjustment increment in mil based rifle scopes 0.1 mil, called 1 centimeter clicks since 0.1 mil equals 1 cm @ 100 meters, 2 cm @ 200 meters, etc. similarly, adjustment click on scope 0.2 mil adjustment move point of bullet impact 2 cm @ 100 m , 4 cm @ 200 m, etc.


when using scope both mil adjustment , reticle mil markings (called mil/mil scope), shooter can spot own bullet impact , correct sight if needed. if shot miss, mil reticle can used ruler count number of mils shot off target. number of mils correct multiplied ten if scope has 0.1 mil adjustments. if instance shot 0.6 mil right of target, 6 clicks needed adjust sight. way there no need math, conversions, knowledge of target size or distance. true first focal plane scope @ magnifications, variable second focal plane must set given magnification (usually maximum magnification) mil scales correct.


when using scope mil adjustments, without mil markings in reticle (i.e. standard duplex cross-hair on hunting or benchrest scope), sight correction known target subtension , known range can calculated formula:








adjustment in mils

=


subtension in mm
range in m




{\displaystyle {\text{adjustment in mils}}={\frac {\text{subtension in mm}}{\text{range in m}}}}



for instance:



20 mm/50 m = 0.4 mils, or 4 clicks 1/10 mil adjustment scope.
50 mm/1000 m = 0.05 mils, or 1 click 0.05 mil adjustment scope.

in firearm optics, 0.1 mil per click common mil based adjustment value, common rule of thumb that:



one click changes impact many centimeters there hundreds of meters.



i.e 1 cm @ 100 meters, 2.25 cm @ 225 meters, 0.5 cm @ 50 meters, etc., see table below








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