Last update on August 9, 2022 // Source: Amazon API
Rifle Scope Product Details
Sightmark Triple Duty M4 1-6×24 CD Riflescope
Ideal for three gun matches, hunting and home defense, the Sightmark Triple Duty M4 1-6×24 CD Riflescope features a Circle-Dot reticle and a 1-6x magnification for quick target acquisition. Equipped with cutting-edge glass and fully multi-coated optics for exceptional clarity, the Triple Duty 1-6×24 CD transmits a bright, crisp image that makes tracking and shooting targets almost effortless. The one-piece 30mm tube delivers optimal light transmission and a wide field-of-view. Built for maximum reliability in harsh weather conditions, the Triple Duty 1-6×24 CD is O-ring sealed and nitrogen-purged, making it fog proof and water resistant. This precision scope features oversized, locking windage and elevation turrets with -inch MOA clicks, providing an additional level of accuracy and ensuring that the scope stays zeroed. The Sightmark Triple Duty series of riflescopes are complimentary to any shooter’s arsenal.
Rifle Scope Product Features
Adjustment lock with 1/2″ MOA locking turrets and Easy focusing knob
Wide field of view
Precision multicoated optics
Internal lit Circle Dot reticle
Lightweight, Waterproof, and Shockproof
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.
Wide field of view
Precision multicoated optics
Phase corrected coating
Front diopter adjustment
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.
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.
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
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.
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.
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.
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 Scope Maker
Sightmark is a premium supplier for long gun scopes, optics, mounting solutions, and other accessories used for guns like rifles and long guns. They innovate and make their mounts, scopes, and related products by applying elements which are long lasting and resilient. This includes the Sightmark Triple Duty M4 1-6×24 CD Riflescope by Sightmark. For more shooting items, visit their site.
What You Need to Know About Scopes
Rifle scopes allow you to exactly aim a rifle at different targets by aligning your eye with the target over a distance. They do this through magnification by employing a series of lenses within the scope. The scope’s positioning can be dialed in for the consideration of various natural considerations like wind speed and elevation increases or decreases to make up for bullet drop.
The scope’s function is to help the shooter understand precisely where the bullet will hit based upon the sight picture you are viewing with the scope as you align the scope’s crosshair or reticle with the intended target. Most contemporary rifle optics have about 11 parts which are arranged within and outside of the optic. These optic pieces include the rifle scope’s body, lenses, modification turrets, objective focus rings, and other components. See all eleven parts of scopes.
Rifle Scope Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. Deciding on the perfect type of rifle optic depends on what type of shooting you plan to do.
First Focal Plane Optic Facts
Focal plane scopes (FFP) feature the reticle in front of the zoom lens. These types of scopes are useful for:
- Quick acquisition, long distance types of shooting
- Shooting circumstances where computations are marginal
- Experienced shooters who recognize their aim point “hold over” as well as “lead” correlations for their firearm
- Shooters who don’t mind the reticle is bigger and occupies more visual sight room than a SFP reticle
Info on Second Focal Plane Scopes
Second focal plane optics (SFP) feature the reticle to the rear of the zoom lens. In the FFP example with the SFP scope, the 5x “zoom” 100 yard tick measurement would be 1/5th of the non “zoom” tick.
- Long distance forms of shooting where shooters have increased time to make ballistic computations
- Shooting where most shots take place within shorter ranges and spaces
- Shooters who would like a clearer optic picture without room used up by the larger sized FFP reticle
Zoom for Glass
The amount of zoom a scope offers is determined by the size, thickness, and curvatures of the lenses inside of the rifle scope. The zoom of the scope is the “power” of the scope.
Fixed Single Power Lens Scope Facts
A single power rifle 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 zoom of this type of scope can not adjust considering that it is a set power scope.
Adjustable Power Lens Scope Info
Variable power rifle scopes can be tweaked between magnified settings. The power adjustment is handled by using the power ring part of the scope near the rear of the scope by the eye bell.
Power Levels and Range
Here are some advised scope powers and the distances where they can be efficiently used. High power glass will not be as effective as lower magnification scopes considering too much zoom can be a negative aspect depending on your shooting distance. The same concept applies to longer ranges where the shooter needs to have adequate power to see exactly where to properly aim the rifle.
Info on Optic Lens Covering
All contemporary rifle scope and optic lenses are covered in special coatings. There are different types and qualities of coverings. Lens finish can be a crucial element of a rifle when thinking of high end rifle optics and scope equipment. The lenses are among the most key components of the glass considering that they are what your eye sees through while sighting a rifle in on the target. The coating on the lenses protects the lens surface area as well as helps with anti glare capabilities from refracted daylight and color profiles.
HD Versus ED Lens Coatings
Some scope manufacturers also use “HD” or high-definition lens coatings which use various procedures, polarizations, chemicals, and components to draw out different colors and viewable definition through the lens. Some scope producers use “HD” to refer to “ED” meaning extra-low dispersion glass.
Details on Single Finish Versus Multi-Coating
Different optic lenses can even have various finishes applied to them. All lenses normally have at least some kind of treatment or finishing applied to them before being used in a rifle scope or optic assembly. This is because the lens isn’t simply a raw piece of glass. It becomes part of the carefully tuned optic. It requires a coating to be applied to it so that the lens will be optimally functional in lots of types of environments, degrees of sunshine (full light VS shade), and other shooting conditions.
Single layered lenses have a treatment applied to them which is usually a protective and enhancing multi-purpose treatment. This lens treatment can protect the lens from scratches while decreasing glare and other less advantageous things experienced in the shooting environment while sighting in with the scope. The quality of a single coated lens depends upon the scope designer and how much money you spent on it. Both the manufacturer and amount are indicators of the lens quality.
Some scope makers likewise make it a point to specify if their optic lenses are layered or “multi” coated. This means the lens has numerous treatments applied to them. If a lens receives numerous treatments, it can establish that a producer is taking numerous actions to fight various natural aspects like an anti-glare finishing, a scratch resistant anti-abrasion covering, followed by a hydrophilic coating. This also doesn’t necessarily imply the multi-coated lens will perform much better than a single coated lens. Being “better” is dependent on the maker’s lens treatment innovation and the quality of components used in building the rifle glass.
Info on Anti-water Finishing
Water on a scope lens doesn’t assist with retaining a clear sight picture through an optic at all. Lots of top of the line and premium scope makers will coat their lenses with a hydrophobic or hydrophilic finish. The Steiner Optics Nano-Protection is a good example of this sort of treatment. It deals with the surface area of the Steiner scope lens so the water molecules can not bind to it or develop surface tension. The outcome is that the water beads slide off of the scope to maintain a clear, water free sight picture.
Rifle Scope Installation Options
Mounting solutions for scopes come in a couple of choices. There are the standard scope rings which are separately mounted to the scope and one-piece scope mounts which cradle the scope. These different kinds of mounts also usually are made in quick release variations which use throw levers which permit rifle shooters to rapidly install and dismount the glass.
Hex Key Optic Rings
Standard, clamp style mounting scope rings use hex head screws to mount to the flattop design Picatinny scope installation rails on rifles. These types of scope mounts use a couple of different rings to support the optic, and are made from 7075 T6 billet aluminum which is designed for long range accuracy shooting. This type of scope install is excellent for rifles which need a long lasting, sound mounting solution which will not move no matter how much the scope is moved or abuse the rifle takes.
Quick-Release Cantilever Scope Ring Mounts
These types of quick-release rifle scope mounts can be used to rapidly connect and detach a scope from a rifle before reattaching it to a different rifle. Multiple scopes can even be switched out if they all use a compatible design mount. These types of mounts are convenient for long guns which are transferred a lot, to swap out the optic from the rifle for protection, or for optics which are used in between several rifles.
Rifle Scope Tube Sealing and Gas Purging
Wetness inside your rifle optic can destroy a day of shooting and your costly optic by resulting in fogging and creating residue inside of the scope’s tube. A lot of optics prevent moisture from going into the optical tube with a system of sealing O-rings which are waterproof. Typically, these water resistant scopes can be submerged within 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be more than enough moisture content prevention for standard use rifles for hunting and sporting purposes, unless you anticipate taking your rifle aboard watercrafts and are concerned about the optic still functioning if it goes overboard and you can still recover the gun.
Details on Rifle Glass Tube Gas Purging
Another component of avoiding the buildup of moisture within the rifle scope’s tube is filling the tube with a gas like nitrogen. Given that this space is already occupied by the gas, the scope is less altered by climate changes and pressure differences from the external environment which might potentially permit water vapor to seep in around the seals to fill the vacuum which would otherwise be there. These are good qualities of a good rifle scope to seek out.