EOTECH Help Center
It's our mission to serve you, our loyal consumers. Please use the contact form below to reach out to our Customer Service team.
Toll Free: 888-EOTHOLO
Product & Website Support: 734-356-8030
Support Hours: 9:00-17:00 EST, M-Th; 9:00-16:00 EST, F
Address:
HEADQUARTERS & REPAIRS
46900 Port St.
Plymouth, MI 48170
734-356-8030
EOTECH NORTH
2207 Traversefield Dr.
Traverse City, MI 49686
EOTECH WEST
3580 Bassett Street
Santa Clara, CA 95054
Frequently Asked Questions
HWS
WHAT ARE MINUTES OF ANGLE (MOA)?
MOA stands for minutes of angle.
1 MOA is nearly 1 inch at 100 yards.
The center dot in the standard reticle is 1 MOA across.
The ring in the standard reticle is 68 MOA across.
The windage shaft and the elevation shaft on your HWS move in approx. half-MOA increments. This means every tactile click or single adjustment of the shaft moves your point of aim approximately.
1/2 inch at 100 yards
1/4 inch at 50 yards
1/8 inch at 25 yards
HOW IS THE HWS MOUNTED?
The HWS is equipped with an integral mounting platform to interface directly with any standard 1 Weaver dovetail or Picatinny Mil spec 1913 mounting rail:
Tactical weapons, typically including modern sporting rifles, sub guns, M16/M4, and shotguns
Weapon platforms with a Weaver dovetail base on the receiver, including modern sporting rifle flat tops
Handguns (although holstering is a problem)
Other mounting options include:
Tapping the receiver of the gun
Using a non-gunsmithing add-on mounting platform to provide the dovetail base
Using cantilever shotgun barrels
Most standard tactical weapons have 1 or 2 mounting solutions, which vary in design. They allow co-witness of the iron sights, access to the iron sights, and cheekweld positions. Make sure to mount the HWS with the battery compartment facing the muzzle and away from the operator.
HOW TO MECHANICALLY ZERO AN EOTECH WITH IRON SIGHTS
All EOTECH sights are designed to co-Witness with iron sights on the standard AR15 platform. Sights with side buttons and/or factory equipped quick detach levers will co-witness in the lower 1/3 of the window. All other models will co-witness in the center of the window. This is based on the model chosen at time of purchase.
Make sure your firearm is unloaded and verified safe.
Flip up the iron sights and set the rear sight on the small aperture. You must do this process utilizing the front and rear iron sights, it will not work without a rear sight.
With your EOTECH turned on, look through the rear peep sight with the front post in view.
After obtaining a sight picture, adjust the EOTECH so the 1 MOA dot sits directly on top of the front post.
Once this is achieved, final zero should be verified using live fire.
Note: When adjusting to iron sights, you are moving the image to the fixed point of aim so your adjustment dials on the sight are in reverse or mirrored.
HOW TO LASER BORE SIGHT YOUR EOTECH
Make sure your firearm is unloaded and verified safe.
Insert laser sighting device into barrel and project a dot onto a wall at 21 feet (7 yards).
Turn the EOTECH on and adjust the brightness settings so the center dot is dimmer than the laser bore projected dot (the center dot on the EOTECH will not be used in this process).
Adjust the EOTECH to the projected laser on the wall and align the bottom of the outer circle at the 6 o-clock hash mark position while looking through the EOTECH. Complete the zero with live fire at 50 yards using the center dot for point of aim.
DOES THE HWS HAVE PARALLAX?
All optics experience varying degrees of parallax depending on use and operating conditions. Parallax is an apparent change in the point of aim resulting from a change in the position of the shooter. EOTECH’s sights have little parallax when the reticle is in the center of the viewing window, which is the optimum sighting position and also is the correct place for zeroing the sight. On the other hand, if the user is looking through the sight at the outer edge of the sight window – an off-axis view – the parallax error might be up to 4±3 MOA (or a total of 14 MOA across the viewing window) at 71˚ F (for a sight properly zeroed). In other words, parallax can increase as the user’s view approaches the edge of the EOTECH viewing window. To put this possible amount of off-axis error into perspective, 7 MOA equates to 1.75 inches at 25 yards or 7 inches at 100 yards. Viewing through the center of the window achieves the least parallax error. Parallax may increase as temperature changes from 71˚ F. At operating temperature extremes of -40˚ F or 122˚ F, there may be an additional 4 MOA of parallax.
CAN EOTECH HWS HANDLE HARSH RECOIL?
EOTECH sights are designed and tested to withstand punishing recoil from a variety of firearms. HWS units have been used on the military's M2 .50BMG machine gun, Smith and Wesson .500 and .460 pistols in Africa, shotguns of all sizes, and can even handle the reverse recoil found in air guns and crossbows.
FOR WHAT TACTICAL APPLICATIONS CAN THE HWS BE USED?
Typical tactical applications are with shoulder-mounted small arms weapon systems, such as these:
AR15 & AR10 Modern Sporting Rifles
MP5-style sub guns
M4/M16 and derivatives
Shotguns
Bolt and lever action rifles with a one-piece Weaver rail
The HWS is also used extensively on less-lethal launching platforms:
37 mm and 40 mm
Shotgun applications involving bean bag rounds
Rubber bullets
Deployment of gas munitions
Other applications include:
Medium-caliber (.50) machine gun weaponry
Shoulder-mounted rocket launchers
Grenade-launching platforms
In all cases, HWS greatly enhances speed, accuracy, ease of use, and vision maintenance.
WHAT ARE THE ADVANTAGES OF HWS FOR CLOSE-QUARTER BATTLE (CQB)?
Advantages of EOTECH’s HWS for CQB include:
Speed – The HWS is considered, by most, to be the fastest sight on the market today.
Vision – Maintenance of the operator’s peripheral vision, with the tubeless HUD architecture and 2-eyes-open shooting.
Ease of use – This leads to incredible accuracy, which provides the operator with controlled confidence in his shooting ability.
CAN I USE THE HWS FOR LONG-RANGE ENGAGEMENT?
Yes. The HWS can be used with extreme accuracy for engagement to 300 meters.
The HWS provides a much greater field of view than a magnified scope, providing the operator with more visibility in a tactical engagement area.
However, the clear objective advantage is in close-quarter battle (CQB) situations, in which speed is a must. The HWS is an obvious choice for modern sporting rifles including the M16 or M4, weapons used for both CQB and longer-range engagements.
Need to increase your visibility for longer range shooting? Look at partnering the HWS with our G33.STS magnifier. With a magnification of 3x and an adjustable diopter, the target will be in clear focus allowing the operator to make a more precise shot. The switch-to side mount allows for incredibly fast transition times between close-quarter and mid to long range shooting making this combination the best of both worlds.
IS ANY LIGHT THAT CAN BE SEEN CAST ON THE TARGET?
No, there is none. Unlike a laser or red dot sights, the holographic image projects no forward light onto the target. So there is no position-revealing light.
The projected reticle is visible only to the operator.
In addition, there is no muzzle-side reflective glare from coated lenses like on red dot sights, scopes, or binoculars. The HWS does not need any costly add-on filters that would also significantly reduce the effective light transmission and make the target less visible.
IS THE HWS WATER RESISTANT?
Yes. EOTECH HWS are water resistant. The depth to which each model can be submerged varies.
VUDU
WHAT IS THE THICKNESS (LINE WEIGHT) OF THE RETICLES IN MOA?
The weight of each line is optimized based on the model of scope. The weight as well as all other measurements for each reticle can be found on the product page.
WHAT ARE THE OUTER DIAMETERS OF THE EYEPIECE AND OBJECTIVE TUBE (FOR AFTERMARKET SCOPE COVERS)?
This information is under the “details” tab of each product; all relevant measurements are listed as each model is unique.
WHAT IS THE DIAMETER OF THE 1-6X “SPEED RING” IN MOA?
The “Speed Ring” on the Vudu 1-6x has an OD that subtends approximately 240 MOA and from tip to tip the outer tic marks subtend 300 MOA. All reticle measurements can be found on the product page.
WHAT PART OF THE RETICLES ARE ILLUMINATED?
The illumination on each reticle is optimized based on its design and intended use, for this reason each reticle is different. The reticle illumination points will be called out in red on the reticle dimension drawing that can be accessed from the product page.
WHICH MODELS HAVE LOCKING TURRETS?
5-25x50 FFP has a locking elevation turret with a capped windage turret. All the SFP models have capped turrets, and the remaining FFP scopes have exposed tactical turrets.
WHAT MODELS HAVE ZERO STOPS?
5-25x50 FFP, 3.5-18x50 FFP, and the 2.5-10x44 FFP each feature our EZ Check Zero Stop.
WHAT RECOIL ARE THE SCOPES RATED FOR?
The complete Vudu line of scopes is designed around and tested to G force loads that exceeds any modern sporting cartridge. If you do manage to break one due to recoil forces, please tell us the amazing story when you send it in for repair or replacement at no charge using our Vudu Advantage Warranty.
WHAT IS THE OVERALL LENGTH OF EACH SCOPE?
The dimensions of each scope is listed on each product page.
WHAT IS THE DIFFERENCE BETWEEN FFP AND SFP?
First Focal Plane (FFP) scopes have the reticle lens located in the FFP so as the magnification changes, the apparent size of the reticle changes at the same ratio. This is helpful because the sub-tension (what the reticle measures/ covers at distance) is always the same regardless of the magnification. This is a necessary feature if you plan to hold elevation or for wind at different magnification settings, as with a Mil-Dot or Horus reticle.
Second Focal Plane (SFP) scopes have the reticle lens in the SFP so the reticle stays the same size regardless of magnification. This is helpful if you plan to use the rifle for hunting or fixed range sport shooting as the reticle remains easy to see at all magnification levels. Sub-tensions are only accurate at a single power (usually the maximum magnification).
There are a number of references available online that can give you the fine points of FFP and SFP reticles, there are also MANY debates on which is better. We prefer you research the different reticles to determine which best fits your needs.
WHAT IS THE TOTAL TRAVEL OF THE WINDAGE AND ELEVATION TURRETS?
The total travel of the turrets is specific to each model and can be found on each product page.
WHY IS THE ILLUMINATION ON RETICLES NOT VISIBLE IN BRIGHT DAYLIGHT?
Only the center dot on the 1-8x SFP is designed to be visible in bright daylight. The other models are all etched reticles with illumination in key areas for use in low light conditions and with clip on ancillary devices (i.e. thermals). The trade off to get brighter illumination on etched reticles is cost, battery life, heavy reticle lines and/or illuminate more of the reticle. Each of these options detracts from the overall value, and/or usefulness of the optics primary role. We have attempted to optimize the reticle line weight for the intended precision role of each optic while giving good illumination for low light conditions.
It is important to remember that Vudu is a precision magnified optic, not a Red Dot Sight (RDS) and certainly not a Holographic Weapon Sight (HWS) which are specifically designed for bright daylight conditions.
HOW MUCH DO THE VUDU QD 1-PIECE MOUNTS WEIGH?
The exact weight can be found on each product page.
WHAT IS THE SIZE OF THE DOT?
Each reticle varies in size based on the model, but the dimensions can be found on each product page.
WHAT IS THE DIFFERENCE BETWEEN MIL AND MRAD AND MOA?
MRAD and Mil are just different terms for Milliradian, MOA stands for Minute of Angle. Both are units of angular measurement.
A Minute is 1/60th of anything so a Minute of Angle is 1/60th of a degree. Since this is an angular measurement it “grows” as the arms get further away from the starting point (vertex). At 100 yards, an MOA measures approximately 1 inch (exactly 1.047”) and continues to grow at the same rate. You can estimate 1 MOA is 1” times the distance in yards.
A Milliradian is a SI derived minute of angle that is 1/1000 of a radian (0.001 radian). Most rifle scopes using a MRAD based design adjusts in 0.1 MRAD increments (0.1 MRAD per-click). 0.1 MRAD is equal to 1 cm at 100 m (or approx. 3.6” at 100 yards).
What type should you choose? We recommend whatever you're comfortable with as it really doesn’t matter as long as you match your turrets to your reticle (all Vudu Rifle scopes are matched), and PRACTICE with your system.
EFLX
ARE ALL RED DOT SIGHTS PARALLAX FREE?
It is a common misconception that red dot or holographic sights are parallax free. Every optic will have some degree of parallax. Most red dots and holographic sights are focused at a distance where parallax is minimized and imperceivable to the user. Parallax will typically be more pronounced at close range.
ARE THERE ANY STATES THAT RED DOT SIGHTS ARE ILLEGAL?
To EOTECH’s knowledge there are no states where red dot sights are illegal for recreational or professional use. When it comes to hunting, there may be some states that have restrictions. Please check your states game and fish department for details and clarification.
WHAT RED DOT DOES THE MILITARY USE?
The military, both US and International, use a variety of red dot brands and holographic sights. Each department or MOD may standardize on different products. EOTECH products have historically been standardized by USSOCOM as well as purchases/contracts from all of the US military departments.
IS THE EFLX MADE IN THE USA?
The EFLX does include foreign components but is fully tested, qualified, and assembled in Plymouth, MI, USA.
CAN YOU USE A RED DOT SIGHT WITH NIGHT VISION?
The EFLX does include (1) night vision setting to work with night-vision devices. The quality of the night-vision device and its tube sensitivity will determine how usable the NV setting will be.
WHAT IS THE DIFFERENCE BETWEEN OPEN AND CLOSED EMITTER ON A RED DOT SIGHT? WHAT ARE THE BENEFITS OF EACH?
An open emitter red dot sight design is one where the LED emitter is open to environmental elements. The benefits to this is that the housing is more open and provides a cleaner sight picture. A negative is that the LED is exposed to dirt, rain or other debris that can cover or distort the LED output. A closed emitter red dot is one in which the LED is protected and enclosed by a full housing. This eliminates any opportunity to negatively affect the LED source and allows for better fog and waterproofing. Negatives are that it provides more of a tubed sight picture that limits the users field of view and it introduces an additional rear window that will reduce light transmission.
WHAT IS THE BEST WAY TO ZERO A RED DOT SIGHT?
EOTECH recommends zeroing a red dot sight consistent to other sights and scopes. If available, using a laser bore-sighter to get on paper faster is recommended. If not, traditional bore-sighting will still help facilitate getting hits on paper. Once on paper, use the windage and elevation adjustments to dial in 3-shot groups until a satisfactory zero is achieved.
CAN YOU USE THE EFLX ON A SHOTGUN? AR-15?
Although ideal for pistol use, the EFLX can be used on almost any firearm configuration. It is an excellent optic on a shotgun due to its low position on the receiver. It can also be used as a primary optic on AR15’s or be mounted on a 33 or 45 degree offset mount as a 1X solution when magnified optics are in use.
Vudu Rifle Scope FAQs
VUDU
WHAT IS THE THICKNESS (LINE WEIGHT) OF THE RETICLES IN MOA?
The weight of each line is optimized based on the model of scope. The weight as well as all other measurements for each reticle can be found on the product page.
WHAT ARE THE OUTER DIAMETERS OF THE EYEPIECE AND OBJECTIVE TUBE (FOR AFTERMARKET SCOPE COVERS)?
This information is under the “details” tab of each product; all relevant measurements are listed as each model is unique.
WHAT IS THE DIAMETER OF THE 1-6X “SPEED RING” IN MOA?
The “Speed Ring” on the Vudu 1-6x has an OD that subtends approximately 240 MOA and from tip to tip the outer tic marks subtend 300 MOA. All reticle measurements can be found on the product page.
WHAT PART OF THE RETICLES ARE ILLUMINATED?
The illumination on each reticle is optimized based on its design and intended use, for this reason each reticle is different. The reticle illumination points will be called out in red on the reticle dimension drawing that can be accessed from the product page.
WHICH MODELS HAVE LOCKING TURRETS?
5-25x50 FFP has a locking elevation turret with a capped windage turret. All the SFP models have capped turrets, and the remaining FFP scopes have exposed tactical turrets.
WHAT MODELS HAVE ZERO STOPS?
5-25x50 FFP, 3.5-18x50 FFP, and the 2.5-10x44 FFP each feature our EZ Check Zero Stop.
WHAT RECOIL ARE THE SCOPES RATED FOR?
The complete Vudu line of scopes is designed around and tested to G force loads that exceeds any modern sporting cartridge. If you do manage to break one due to recoil forces, please tell us the amazing story when you send it in for repair or replacement at no charge using our Vudu Advantage Warranty.
WHAT IS THE OVERALL LENGTH OF EACH SCOPE?
The dimensions of each scope is listed on each product page.
WHAT IS THE DIFFERENCE BETWEEN FFP AND SFP?
First Focal Plane (FFP) scopes have the reticle lens located in the FFP so as the magnification changes, the apparent size of the reticle changes at the same ratio. This is helpful because the sub-tension (what the reticle measures/ covers at distance) is always the same regardless of the magnification. This is a necessary feature if you plan to hold elevation or for wind at different magnification settings, as with a Mil-Dot or Horus reticle.
Second Focal Plane (SFP) scopes have the reticle lens in the SFP so the reticle stays the same size regardless of magnification. This is helpful if you plan to use the rifle for hunting or fixed range sport shooting as the reticle remains easy to see at all magnification levels. Sub-tensions are only accurate at a single power (usually the maximum magnification).
There are a number of references available online that can give you the fine points of FFP and SFP reticles, there are also MANY debates on which is better. We prefer you research the different reticles to determine which best fits your needs.
WHAT IS THE TOTAL TRAVEL OF THE WINDAGE AND ELEVATION TURRETS?
The total travel of the turrets is specific to each model and can be found on each product page.
WHY IS THE ILLUMINATION ON RETICLES NOT VISIBLE IN BRIGHT DAYLIGHT?
Only the center dot on the 1-8x SFP is designed to be visible in bright daylight. The other models are all etched reticles with illumination in key areas for use in low light conditions and with clip on ancillary devices (i.e. thermals). The trade off to get brighter illumination on etched reticles is cost, battery life, heavy reticle lines and/or illuminate more of the reticle. Each of these options detracts from the overall value, and/or usefulness of the optics primary role. We have attempted to optimize the reticle line weight for the intended precision role of each optic while giving good illumination for low light conditions.
It is important to remember that Vudu is a precision magnified optic, not a Red Dot Sight (RDS) and certainly not a Holographic Weapon Sight (HWS) which are specifically designed for bright daylight conditions.
HOW MUCH DO THE VUDU QD 1-PIECE MOUNTS WEIGH?
The exact weight can be found on each product page.
WHAT IS THE SIZE OF THE DOT?
Each reticle varies in size based on the model, but the dimensions can be found on each product page.
WHAT IS THE DIFFERENCE BETWEEN MIL AND MRAD AND MOA?
MRAD and Mil are just different terms for Milliradian, MOA stands for Minute of Angle. Both are units of angular measurement.
A Minute is 1/60th of anything so a Minute of Angle is 1/60th of a degree. Since this is an angular measurement it “grows” as the arms get further away from the starting point (vertex). At 100 yards, an MOA measures approximately 1 inch (exactly 1.047”) and continues to grow at the same rate. You can estimate 1 MOA is 1” times the distance in yards.
A Milliradian is a SI derived minute of angle that is 1/1000 of a radian (0.001 radian). Most rifle scopes using a MRAD based design adjusts in 0.1 MRAD increments (0.1 MRAD per-click). 0.1 MRAD is equal to 1 cm at 100 m (or approx. 3.6” at 100 yards).
What type should you choose? We recommend whatever you're comfortable with as it really doesn’t matter as long as you match your turrets to your reticle (all Vudu Rifle scopes are matched), and PRACTICE with your system.
