Description
Last update on June 3, 2023 // Source: Amazon API
Rifle Scope Product Details
Sightmark Triple Duty Riflescope
Get closer to your target with the Sightmark Triple Duty 8.5-25×50 MDD Riflescope. Tested and recommended by the National Tactical officers Association, this high-power riflescope features a large 50mm objective lens and a Mil-Dot reticle that offers bright, crisp images at long distances. Designed for superior range estimation and long-distance shooting, the 8.5-25×50 Riflescope utilizes cutting-edge glass with fully multi-coated optics for exceptional clarity. The one-piece 30mm tube offers a wide field-of-view and fully multi-coated optics for a bright, crisp image. O-ring sealed and nitrogen-purged, the Triple Duty 8.5-25×50 Riflescope is both fog proof and water resistant. This precision scope features a parallax adjustment knob and oversized, locking windage and elevation turrets with 1/8-inch MOA clicks, providing an additional level of accuracy and ensuring that the scope stays zeroed. The Triple Duty series of riflescopes are complimentary to any shooter’s arsenal.
Rifle Scope Product Features
Weatherproof, shockproof, fogproof
Windage/Elevation adjustment lock
Second focal plane reticle (true at 10x)
Etched reticle with Red and green reticle illumination
30mm main tube
Sightmark Triple Duty Riflescope
The Sightmark Triple Duty Series of riflescopes use cutting edge glass and lens coatings to ensure that it is the most accurate riflescope in its class. Precision multicoated optics are a distinguishing feature of the Sightmark Triple Duty riflescope line; multicoated lenses offer a clear view for easy target acquisition in both bright and low light situations. Both waterproof and fog proof, the nitrogen filled Sightmark Triple Duty Series features oversized windage, elevation and parallax adjustment knobs for easy adjustment in the field. Locking mechanisms on the windage and elevation adjustments ensure that the scope stays zeroed. Internal lit Mil-Dot reticles help shooters successfully make accurate shots over a wide range of distances and lighting conditions.
Precision accuracy
Mil-Dot reticle
Wide field of view
Precision multicoated optics
Phase corrected coating
Front diopter adjustment
Nitrogen purged
Lightweight, Waterproof, Shockproof, and Fog proof
Windage and Elevation Adjustment
Use a 1.5mm metric hex wrench to loosen the three set screws located along the scalloped edge of the elevation turret. Next, lock down the locking thumb screw on top of the knob. Then rotate the knob and set the MOA hash marks back to zero. Once the knob is zeroed, retighten the three set screws making sure not to over-torque and strip them. After all three set screws are sufficiently tightened, the mechanism will re-engage.
MD Reticle
The US Army Mil Dot reticle (MD and MDD) comes in two illumination versions. The MD reticle, initially Sightmark’s standard reticle, illuminates the entire Mil-Dot crosshair. This is intended to provide the shooter a keen aiming point for assistance in accurate shooting. In order to use the Mil-Dot reticle accurately, please read the following: Mil stands for millradian, 1/1623.2th of a circle or 3.438 MOA. The millradian represents 1 unit at 1000 yds. To simplify, a target that is one yard tall at 1000 yds would measure 1 millradian.
Parallax Adjustment
Sightmark’s higher magnification riflescopes do come equipped with a parallax adjustment knob. Parallax is the change of angular position of two stationary points relative to each other as seen by an observer. In other words, it’s how the image lines up in the riflescope and how the eye perceives it. Be sure to adjust the parallax knob to the correct shooting range. It is very important to keep this in mind when zeroing the rifle. If this is not taken into consideration at the time of sighting in the riflescope, accuracy will diminish.
Other Triple Duty Reticles
CD Reticle
The Circle Dot reticle (CD) features a circle dot with illumination capability. Provided only on the 1-6×24, the circle dot provides accurate shooting results at any magnification level. Perfect for tactical shooting, the circle dot rovides quick taget acquisition at 1x magnification and supreme accuracy at 6x magnification ideal for when conflicts advance to medium range shooting.
CDX Reticle
The Circle Dot Duplex reticle (CDX) features a circle dot with illumination capability with broad exterior subtensions. The central circle dot provides accurate shooting results at any magnification level; and with illumination capability it provides reticle contrast against backgrounds in low light conditions. The shortened exterior subtensions create an unobstructed view of the target allowing for quick target acquisition at any range.
DX Reticle
The Dot Duplex reticle (DX) features a fine central crosshair with a center illumination aiming point. This provides the shooter a keen aiming point for added accuracy while shooting. The broad exterior subtensions create contrast between the target allowing for quick reticle recognition. The Dot Duplex reticle creates an unobstructed view of the target, perfect for making precision shots while hunting.
MDD Reticle
The US Army Mil Dot reticle (MD and MDD) comes in two illumination versions.The MDD version illuminates the center point of the Mil-Dot cross hair only. This is intended to provide the shooter a keen aiming point for assistance in accurate shooting. In order to use the Mil-Dot reticle accurately, please read the following:
Mil stands for millradian, 1/1623.2th of a circle or 3.438 MOA. The millradian represents 1 unit at 1000 yds. To simplify, a target that is one yard tall at 1000 yds would measure 1 millradian.
Triple Duty 8.5-25×50 Riflescope Triple Duty M4 1-6×24 CDX Riflescope Triple Duty 2.5-10×32 MDD Riflescope Triple Duty 3-9×42 DX Riflescope
Reticle type MD, CDX, DX, MDD CD, CDX, DX MD, CDX, DX, MDD CDX, DX, MDD
Objective lens diameter 50 24 12 32
Field of view (m @ 100m) 4.89-1.66 33.47-5.53 13.99-4.64 14.69-3.67
Parallax 12- 100 100 100
Windage / Elevation 60 90 60 100
MOA 1/8″ 1/2″ 1/4″ 1/4″
Windage / Elevation lock yes yes no yes
About the Sightmark Company
Sightmark is a premium maker for weapon scopes, optics, mounts, and other add-ons used for firearms like rifles and long guns. They create and supply their mounts and related products working with elements which are long lasting and resilient. This includes the Sightmark Triple Duty Riflescope by Sightmark. For additional shooting items, visit their site.
What You Need to Know About Rifle Glass
Rifle scopes enable you to specifically aim a rifle at various targets by lining up your eye with the target at range. They accomplish this through magnifying the target by utilizing a set of lenses inside the scope. The scope’s alignment can be adjusted to take into account many natural considerations like wind and elevation to account for bullet drop.
The scope’s function is to help shooters understand precisely where the bullet will hit based on the sight picture you are seeing via the scope as you align the scope’s crosshair or reticle with the intended point of impact. Most modern-day rifle optics have around 11 parts which are found internally and externally on the scope body. These scope parts include the rifle scope’s body, lenses, windage and elevation turrets or dials, focus rings, and other elements. See all eleven parts of a rifle optical system.
The Varieties of Rifle Scopes
Rifle scopes can be either “first focal plane” or “second focal plane” style of scopes. The type of focal plane an optic has identifies where the reticle or crosshair lies in connection with the optic’s magnifying adjustments. It simply indicates the reticle is behind or in front of the magnification lens of the optic. Deciding on the very best form of rifle optic depends upon what form of shooting you intend on doing.
Info on First Focal Plane Scopes
Focal plane scopes (FFP) feature the reticle in front of the magnification lens. These styles of scopes are useful for:
- Quick acquisition, long distance kinds of shooting
- Shooting scenarios where estimations are very little
- Experienced shooters who recognize their aim point “hold over” as well as “lead” equations for their long gun
- Shooters who do not mind the reticle is bigger and occupies more visual sight room than a SFP reticle
Second Focal Plane Scope Details
Second focal plane scopes (SFP) include the reticle to the rear of the magnification lens. In the FFP example with the SFP scope, the 5x “zoom” one hundred yard tick measurement would be 1/5th of the non “zoom” tick reticle measurement.
- Long distance styles of shooting where shooters have more time to make ballistic computations
- Shooting where most shots occur within shorter proximities and ranges
- Shooters who choose a clearer optic picture with less area used up by the bigger FFP reticle
Glass Magnification
The quantity of scope magnification you need on your optic depends on the form of shooting you plan to do. Just about every type of rifle optic delivers some amount of zoom. The amount of magnification a scope gives is determined by the size, density, and curves of the lens glass within the rifle optic. The zoom of the optic is the “power” of the scope. This implies what the shooter is observing through the scope is magnified times the power factor of what can usually be seen by human eyes.
Fixed Single Power Lens Rifle Glass Facts
A single power rifle optic and scope uses a magnification number designator like 4×32. This suggests the magnification power of the scope is 4x power and the objective lens is 32mm. The magnification of this type of scope can not fluctuate given that it is a fixed power scope.
Variable Power Lens Rifle Optic Facts
Variable power rifle scopes have adjustable power. It will note the magnification degree in a configuration like 2-10×32. These numbers indicate the zoom of the scope can be adjusted in between 2x and 10x power. This always includes the power levels in-between 2 and 10. The power modification is achieved by applying the power ring component of the scope near the rear of the scope by the eye bell piece.
Power Levels and Range Correlations
Here are some suggested scope powers and the distances where they can be efficiently used. High power scopes will not be as useful as lower magnification scopes considering that too much magnification can be a negative aspect depending on your shooting distance. The very same idea goes for longer ranges where the shooter needs to have increased power to see precisely where to best aim the rifle at the target.
Rifle Glass Lens Finish
All state-of-the-art rifle optic lenses are covered. Lens finish is a significant aspect of a shooting system when thinking about high end rifle optics and scope systems.
HD Versus ED Rifle Glass Lens Coatings
Some glass suppliers additionally use “HD” or high-definition glass coverings that employ various procedures, chemical applications, polarizations, and aspects to draw out separate colors and viewable definition through the lens. This high-def covering is commonly used with higher density lens glass which decreases light’s potential to refract through the lens glass. Some scope makers use “HD” to describe “ED” signifying extra-low dispersion glass. ED deals with how certain colors are represented on the chroma spectrum and the chromatic aberration or difference which is also called color distortion or fringing. Chromatic aberration is often obvious around objects with well defined shapes as light hits the item from various angles.
Details on Single Coating Versus Multi-Coating
Different optic lenses can even have various coatings applied to them. All lenses typically have at least some type of treatment or finishing applied to them before being used in a rifle scope or optic. Because the lens isn’t simply a raw piece of glass, they require performance enhancing coatings. It becomes part of the finely tuned optic. It requires a coating to be applied to it so that it will be efficiently functional in numerous kinds of environments, degrees of light (full light VS shaded), and other shooting conditions.
Single coated lenses have a treatment applied to them which is normally a protective and enhancing multi-purpose treatment. This lens treatment can safeguard the lens from scratches while minimizing glare and other less advantageous things experienced in the shooting environment while sighting in with the scope. The quality of a single covered lens depends upon the scope producer and just how much you spent for it. Both the make and cost are indicators of the lens quality.
Some scope manufacturers likewise make it a point to define if their optic lenses are covered or “multi” coated. This implies the lens has had multiple treatments applied to the surfaces of the glass. If a lens gets several treatments, it can prove that a maker is taking several actions to combat various natural elements like an anti-glare coating, a scratch resistant anti-abrasion covering, followed by a hydrophilic covering. This also doesn’t always mean the multi-coated lens will perform better than a single coated lens. Being “better” hinges on the maker’s lens treatment techniques and the quality of components used in creating the rifle optic.
Info on Hydrophobic Finishing
Water on a scope’s lens doesn’t support retaining a clear sight picture through a scope at all. Many top of the line and premium optic manufacturers will coat their lenses with a hydrophilic or hydrophobic finish. The Steiner Optics Nano-Protection is a fine example of this sort of treatment. It deals with the surface area of the Steiner glass lens so the H2O particles can not bind to it or create surface tension. The result is that the water beads move off of the scope to preserve a clear, water free sight picture.
Rifle Glass Installing Choices
Installing approaches for scopes can be found in a couple of choices. There are the basic scope rings which are separately installed to the optic and one-piece scope mounts which cradle the scope. These various types of mounts also generally come in quick release versions which use manual levers which permit rifle shooters to quickly install and remove the scopes.
Hex Key Rifle Glass Ring Mounting Solutions
Standard, clamp-on design mounting scope rings use hex head screws to position to the flattop style Picatinny scope mounting rails on the tops of rifles. These forms of scope mounts use a pair of independent rings to support the scope, and are normally constructed from 7075 T6 billet aluminum which are developed for far away precision shooting. This type of scope mount is ideal for rifle systems which are in need of a durable, unfailing mount which will not change despite just how much the scope is moved about or jarring the rifle takes. These are the type of mounts you should have for a devoted optics setup on a long distance scouting or competition firearm that will seldom need to be altered or recalibrated. Blue 242 Loctite threadlocker can additionally be used to protect against the hex screw threads from wiggling out after they are mounted safely in place. An example of these rings are the 30mm style from Vortex Optics. The set normally costs around $200 USD
Quick-Release Cantilever Optic Ring Mounting Solutions
These types of quick-release rifle scope mounts can be used to rapidly remove a scope and connect it to a different rifle. Numerous scopes can also be switched out if they all use a similar design mount. These types of mounts are convenient for rifle platforms which are transferred a lot, to remove the optic from the rifle for protecting the scope, or for scopes which are used between several rifles or are situationally focused.
Optic Tube Sealing and Gas Purging
Wetness inside your rifle optic can ruin a day of shooting and your pricey optic by causing fogging and creating residue inside of the scope tube. The majority of scopes avoid wetness from going into the scope tube with a system of sealing O-rings which are water resistant.
Info Around Rifle Glass Tube Gas Purging
Another element of avoiding the accumulation of moisture inside of the rifle scope tube is filling the tube with a gas like nitrogen. Since this space is already occupied by the gas, the optic is less influenced by temperature changes and pressure distinctions from the outside environment which could potentially allow water vapor to seep in around the seals to fill the vacuum which would otherwise be there. These are good qualities of a decent rifle scope to look for.
