Last update on September 25, 2023 // Source: Amazon API
Rifle Scope Product Details
SIGHTRON, SIII Long Range Riflescope, S-TAC, 4-20x50mm, 30mm Tube, Side Focus Zero Stop First Focal MH-4 Reticle Black
The S-TAC4-20×50 is the ideal scope for Tactical, Target, Varmint and Hunting applications. The MH-4 reticle is a designed Illuminated reticle, with the vertical and horizontal crosshair intersection in the center. A Zero Stop has been added for tactical applications. The S-TAC4-20x50FFPZSIRMH provides 22. 9 MRAD of elevation adjustment for even the longest shots. A unique flip-up lever is built into the power ring for ease of adjustment on cold days Features: – Side Focus: The Side Focus is designed for all types of competition and target Shooting. The Side Focus will focus from 10 yards to infinity – Illumination Switch: The S-TAC FFP model features an illumination side-switch with 11 alternating positions. The on off switch is incorporated in the side focus knob and allows for a quick return to the previous setting. The readily available CR2032 battery provides up to 300 hours of service depending on intensity and temperature – Zero Stop: The S-TAC FFP model will include Sightron’s Zero Stop. Tactical knob with white lettering will allow the full range of travel. The designed windage knobs are marked in white lettering for left and right adjustments – Nitrogen Gas Charged: Nitrogen filled to provide a lifetime of use from fogging and internal water buildup – Shockproof: Rated for recoil and impact from even the toughest loads – Waterproof: Rain, snow or humidity, Sightron optics are built using 100% sealed system ensuring a lifetime of performance in the most extreme environmental conditions – Zact-7 Revcoat Multi-Coating: Sightron’s Zact-7 Revcoat employs revolutionary lens coating technology featuring fully multi-coated precision ground glass – ExacTrack: This scope features Sightron’s unique ExacTrack windage and elevation adjustment system. No other system on the market comes close to the precision and performance of ExacTrack – Zoom Ring Lever: A pop up style zoom ring lever for ease of use in cold weather climates – Target Turret: Precision adjustable tactical turret in . 1 MRAD adjustments. All models are resettable to zero and are protected by rugged windage and elevation caps – Fast Focus Eyebell: Allows for quick and easy adjustments when in the field Specifications: – Magnification: 4-20X – Objective Diameter: 50mm – Focal Plane: First Focal Plane – Fov (ft@100 Yds. ): 22. 2-4. 36 – Eye Relief: 3. 9-3. 7″ – Reticle Type: Mil-Hash-4(IR) – Click Value (@100 Yds. ): . 1 MRAD – Minutes Per Revolution: 5 MRAD – W/E Travel (@100 Yds. ): 12/22. 9 MRAD – Knob Style: Tactical (Resettable) – Zero Stop: Yes – Focus Type: Side Focus – Parallax Range: 10yds to Infinity – Finish: Matte Black – Waterproof: Yes – Fully Multi Coated: Yes (Zact-7 TM 7-Layer) – Weight: 25. 6 oz. – Length: 15. 0″ – Tube Diameter: 30mm – Sunshade Included: No – Illuminated Reticle: Yes
Rifle Scope Product Features
Nitrogen Gas Charged
Zact-7 Revcoat Multi-Coating
About the SIGHTRON Company
SIGHTRON is a premium supplier for firearm scopes, optics, mounting solutions, and other accessories used for guns like rifles and long guns. They design and manufacture their mounts, scopes, and related products making the most of materials which are durable and long lasting. This includes the SIGHTRON, SIII Long Range Riflescope, S-TAC, 4-20x50mm, 30mm Tube, Side Focus Zero Stop First Focal MH-4 Reticle Black by SIGHTRON. For additional shooting products, visit their site.
About Rifle Optics
Rifle scopes enable you to exactly align a rifle at different targets by lining up your eye with the target at range. They accomplish this through magnification by making use of a set of lenses inside the scope. The scope’s alignment can be adapted for consideration of various environmental things like wind and elevation increases to make up for bullet drop.
The scope’s function is to understand precisely where the bullet will hit based on the sight picture you are seeing via the optic as you line up the scope’s crosshair or reticle with the intended target. The majority of contemporary rifle scopes and optics have about 11 parts which are found internally and on the exterior of the optic. These optic pieces include the rifle scope’s body, lenses, windage and elevation turrets or dials, objective focus rings, and other parts. See all eleven parts of a rifle optical system.
Rifle Glass Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. Finding the best type of rifle optic depends on what type of shooting you plan to do.
Info About First Focal Plane Optics
Focal plane scopes (FFP) include the reticle in front of the magnification lens. These types of scopes are helpful for:
- Quick acquisition, long distance kinds of shooting
- Shooting circumstances where calculations are small
- Experienced shooters who have an idea for their target “hold over” as well as “lead” relationships for their weapon
- Shooters who don’t mind the reticle is enlarged and uses up more visual sight room than a SFP reticle
Info on Second Focal Plane Scopes
Second focal plane scopes (SFP) feature the reticle to the rear of the magnification lens. In the FFP example with the SFP scope, the 5x “zoom” one hundred yard tick would be 1/5th of the non “zoom” tick.
- Far away forms of shooting where shooters have more time to make ballistic computations
- Shooting where most of the shots occur within shorter ranges and proximities
- Shooters who choose a clearer optic sight picture without room used up by the bigger FFP reticle
Ins and Outs of Glass Magnification
The amount of zoom a scope supplies is identified by the size, density, and curvatures of the lenses inside of the rifle scope. The zoom of the scope is the “power” of the scope.
Single Power Lens Glass
A single power rifle optic will have a zoom number designator like 4×32. This indicates the zoom power of the scope is 4x power while the objective lens is 32mm. The zoom of this kind of scope can not adjust because it is a set power scope.
About Adjustable Power Lens Rifle Optics
Variable power rifle scopes have adjustable power. It will list the zoom degree in a configuration like 2-10×32. These numbers imply the zoom of the scope could be set in between 2x and 10x power. This additionally involves the powers in-between 2 and 10. The power modification is achieved using the power ring part of the scope near the back of the scope by the eye bell.
The Power Level and Range of Rifle Scopes
Here are some recommended scope powers and the ranges where they can be effectively used. High power glass will not be as efficient as lower powered scopes because too much zoom can be a negative aspect depending on your shooting distance. The same idea applies to longer distances where the shooter needs to have sufficient power to see precisely where to properly aim the rifle at the target.
About Lens Coatings
All contemporary rifle optic and scope lenses are covered in special coatings. There are different types and qualities of lens coverings. When looking at luxury rifle targeting setups, Lens covering can be an essential element of defining the rifle’s capability. The lenses are one of the most essential components of the glass considering they are what your eye looks through while sighting a rifle in on the point of impact. The coating on the lenses safeguards the lens surface as well as assists with anti glare capabilities from refracted sunrays and color exposure.
HD Versus ED Lens Coatings
Some glass makers will also use “HD” or high-definition lens finishings which take advantage of various processes, rare earth compounds, components, and polarizations to enhance a wide range of colors and viewable definition through lenses. This high-def finish is commonly used with more costly high density glass which brings down light’s opportunity to refract through the lens glass. Some scope makers use “HD” to refer to “ED” implying extra-low dispersion glass. ED handles how colors are presented on the chromatic spectrum and the chromatic aberration or difference which is also called color distortion or fringing. Chromatic aberration is often noticeable around things with well defined outlines as light hits the object from specific angles.
Glass Lens Single Coating Versus Multi-Coating
Different optic lenses can also have various coverings applied to them. All lenses generally have at least some kind of treatment or covering applied to them before being used in a rifle scope or optic. This is because the lens isn’t simply a raw piece of glass. 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 lots of kinds of environments, degrees of sunlight (full VS shade), and other shooting conditions.
This lens treatment can safeguard the lens from scratches while lowering glare and other less useful things experienced in the shooting environment while sighting in with the scope. The quality of a single layered lens depends on the scope manufacturer and how much you paid for it.
Some scope manufacturers similarly make it a point to define if their optic lenses are layered or “multi” covered. Being “much better” depends on the producer’s lens treatment innovation and the quality of products used in developing the rifle scope.
Rifle Scope Lens Anti-water Covering
Water on a lens doesn’t help with maintaining a clear sight picture through a scope at all. Lots of top of the line and high-end scope makers will coat their lenses with a hydrophilic or hydrophobic finish.
Scope Mounting Options
Mounting solutions for scopes can be found in a couple of options. There are the standard scope rings which are separately mounted to the scope and one-piece mounts which cradle the scope. These different types of mounts also typically come in quick release versions which use throw levers which enable rifle shooters to quickly install and remove the optics.
Hex Key Rifle Optic Ring Mounts
Standard, clamp-on design mounting scope rings use hex head screws to mount to the flattop design Picatinny scope mount rails on rifles. These kinds of scope mounts use double independent rings to support the optic, and are made from 7075 T6 billet aluminum which are developed for long distance accuracy shooting. This kind of scope mount is ideal for rifles which require a durable, unfailing mount which will not shift despite how much the scope is moved about or abuse the rifle takes. These are the style of mounts you want for a devoted scope setup on a far away hunting or sniper competition firearm that will almost never need to be changed or recalibrated. Blue 242 Loctite threadlocker can also be used on the mount screws to stop the hex screw threads from backing out after they are mounted safely in position. An example of these rings are the 30mm type made by the Vortex Optics company. The set usually costs around $200 USD
Quick-Release Cantilever Glass Rings
These types of quick-release rifle scope mounts can be used to quickly connect and take off a scope from a rifle before reattaching it to a different rifle. Several scopes can even be swapped out if they all use a compatible style mount. These types of mounts are handy for rifle platforms which are carried a lot, to swap out the optic from the rifle for protection, or for scopes which are used in between several rifles.
Glass Tube Sealing and Gas Purging
Wetness inside your rifle optic can mess up a day on the range and your pricey optic by triggering fogging and developing residue within the scope tube. Most optics protect against wetness from entering the optical tube with a series of sealing O-rings which are waterproof. Normally, these water-resistant scopes can be submerged beneath 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be sufficient humidity prevention for basic use rifles for hunting and sporting purposes, unless you intend on taking your rifle aboard a watercraft and are worried about the optic still functioning if it is submerged in water and you can still rescue the firearm.
Gas Purged Glass Tubes
Another element of preventing the buildup of wetness inside of the rifle optic’s tube is filling the tube with a gas like nitrogen. Considering that this area is currently taken up by the gas, the scope is less altered by climate shifts and pressure differences from the outside environment which could possibly allow water vapor to permeate in around the seals to fill the vacuum which would otherwise exist. These are good qualities of a good rifle scope to look for.