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SWFA SS

12x32 BR

MANUAL

Range Estimation

cont.

The strength of the milliradian (MRAD) based ranging system is the

greatly simplified arithmetic based on multiplying by one thousand.
An object that is 1 yard tall, subtending 1 MRAD on the reticle scale is

1000 yards away from the observer:

Using the formula above, if this same 1 yard tall target subtends

10 MRAD on the reticle, it is 100 yards away.
In order for the arithmetic to remain simple, the target size and distance

to targets must be expressed in the same units, most commonly in feet,

yards or meters.
If the target size is expressed in inches and the distance to target in

yards, a multiplier must be introduced that makes the arithmetic a lot

less intuitive:

𝑇𝑎𝑟𝑔𝑒𝑡 𝑠𝑖𝑧𝑒 (𝑦𝑎𝑟𝑑𝑠)𝑇𝑎𝑟𝑔𝑒𝑡 𝑠𝑖𝑧𝑒 (𝑚𝑟𝑎𝑑)∗1000=𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑡𝑜 𝑡𝑎𝑟𝑔𝑒𝑡 (𝑦𝑎𝑟𝑑𝑠)
(𝑚𝑟𝑎𝑑)∗1000=𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑡𝑜 𝑡𝑎𝑟𝑔𝑒𝑡 (𝑦𝑎𝑟𝑑𝑠)

𝑇𝑎𝑟𝑔𝑒𝑡 𝑠𝑖𝑧𝑒 (𝑖𝑛𝑐ℎ𝑒𝑠)𝑇𝑎𝑟𝑔𝑒𝑡 𝑠𝑖𝑧𝑒
(𝑚𝑟𝑎𝑑)∗27.78=𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑡𝑜 𝑡𝑎𝑟𝑔𝑒𝑡 (𝑦𝑎𝑟𝑑𝑠)

Содержание SS 12X32

Страница 1: ...SWFA SS 12x32 BR MANUAL 1 MANUAL MANUAL...

Страница 2: ...peration and Setup Interpupillary Distance IPD Adjustment Eyecup Adjustment Features 4 Binocular Eyepiece Focus 6 Reticle Focus and Orientation 8 Warranty Information 15 Cleaning and Maintenance 14 Ra...

Страница 3: ...excellent optical performance with an industry first adjustable ranging reticle SWFA SS 12x32 BR THE SWFA SS 12x32 BR Binocular with Ranging Reticle NOTE Avoid looking at any intense light source thr...

Страница 4: ...SWFA SS 12x32 BR MANUAL 4 Rotating Winged Eyecup FEATURES Center Focus Diopter Adjustment Reticle Focus Binocular Barrels Reticle Rotation Basic Operation and Setup Eyepiece Ocular Lenses...

Страница 5: ...h the distance between your eyes To adjust the IPD grasp the binocular with both hands and slowly rotate the binocular barrels inward or outward until you see a single round image without any kidneybe...

Страница 6: ...focus adjustment for the right eye right underneath the rubber eyecup Binocular Eyepiece Focus HOW TO PROPERLY SET UP THE FOCUS 1 Close the right objective of the binocular using an objective cover I...

Страница 7: ...ty of targets at different distances using either eye and both eyes together Optimal focus position for the center focusing knob should the same for both eyes If it is not go back to Step 1 5 Record t...

Страница 8: ...cle Focus and Orientation HOW TO BRING THE RETICLE INTO PROPER FOCUS 1 Set the center focusing knob to infinity position by rotating it counter clockwise until it stops 2 Find something distant and fe...

Страница 9: ...ing rotates the reticle within the Field of View FOV of the binocular Use the adjustment ring to orient the reticle so that the horizontal lines are level with the horizon The optimal alignment of the...

Страница 10: ...observation while being immediately available when needed The maximum object size that can be measured with the reticle is 45 MRAD The spacing between hash marks is 1 MRAD and the stadia are marked at...

Страница 11: ...SWFA SS 12x32 BR MANUAL 11...

Страница 12: ...away from the observer Using the formula above if this same 1 yard tall target subtends 10 MRAD on the reticle it is 100 yards away In order for the arithmetic to remain simple the target size and dis...

Страница 13: ...s tall it can be expressed as 1 5 feet or 0 5 yards A 0 5 yard target subtending 10 MRAD on the reticle is 50 yards away NOTE As a general consideration for most precise range estimation use the large...

Страница 14: ...the lenses If it is time to clean the optics start by blowing off all particles using compressed Cleaning and Maintenance air Never wipe the lenses with abrasive materials and never wipe the lenses d...

Страница 15: ...SWFA SS 12x32 BR MANUAL 15 SWFA SS 12x32 BR MANUAL 15 THE 4 LIFE WARRANTY Never Expires Transferable No Receipt Required No Questions Asked If We Cannot Repair It We Will Replace It...

Страница 16: ...SWFA SS 12x32 BR MANUAL 16 5840 Chris Kyle Memorial Hwy Midlothian TX 76065 SWFA INC SS12X32BR...