Last update on August 16, 2022 // Source: Amazon API
Rifle Scope Product Details
Sightron 25172 SIII Long Range Zero Stop Riflescope, 8-32x56mm 30mm Tube Side Focus MRAD Knob Zero Stop Matte Mil-Dot Reticle
Sightron SIII long range zero stop riflescope, 8-32x56mm specifications: – magnification: 8-32x – objective diameter: 56mm – main tube diameter: 30mm – reticle: Mil-Dot – side focus – 1/4 tactical knobs – coating: multi coated – finish: matte black.
Rifle Scope Product Features
Objective diameter: 56Mm
Main tube diameter: 30Mm
About the SIGHTRON Company
SIGHTRON is a premium manufacturer for weapon scopes, optics, mounting solutions, and other accessories used for firearms like rifles and long guns. They style and build their products by choosing building materials which are long lasting and durable. This includes the Sightron 25172 SIII Long Range Zero Stop Riflescope, 8-32x56mm 30mm Tube Side Focus MRAD Knob Zero Stop Matte Mil-Dot Reticle by SIGHTRON. For more shooting items, visit their site.
What You Need to Know About Optics
Rifle scopes permit you to precisely aim a rifle at various targets by aligning your eye with the target at range. They do this through magnifying the target by employing a series of lenses inside the scope. The scope’s alignment can be adjusted for consideration of varied ecological factors like wind and elevation increases or decreases to make up for bullet drop.
The scope’s function is to help the shooter understand exactly where the bullet will hit based on the sight picture you are viewing via the scope as you align the scope’s crosshair or reticle with the intended target. Many modern-day rifle scopes and optics have around 11 parts which are found within and outside of the scope. These scope parts include the rifle scope’s body, lenses, elevation turrets or dials, focus rings, and other elements. See all eleven parts of scopes.
The Types of Rifle Scopes
Rifle scopes can be either “first focal plane” or “second focal plane” type of optics. Deciding upon the finest type of rifle optic is based around what type of shooting you plan on doing.
First Focal Plane Glass
First focal plane glass (FFP) include the reticle in front of the magnifying lens. This induces the reticle to increase in size based on the amount of zoom being used. The result is that the reticle measurements are the same at the amplified range as they are at the non amplified distance. As an example, one tick on a mil-dot reticle at one hundred yards without “zoom” is still the exact same tick at one hundred yards with 5x “zoom”. These kinds of scopes are practical for:
- Quick acquisition, long distance types of shooting
- Shooting situations where estimations are minimal
- Experienced shooters who recognize their aim point “hold over” plus “lead” equations for their weapon
- Shooters who do not mind the reticle is bigger and takes up more visual sight area than a SFP reticle
About Second Focal Plane Glass
Second focal plane scopes (SFP) feature the reticle to the rear of the magnifying lens. This triggers the reticle to remain at the very same dimensions in relation to the quantity of magnification being used. The effect is that the reticle dimensions change based upon the magnification used to shoot over longer distances considering that the reticle measurements represent various increments which vary with the magnification level. In the FFP illustration with the SFP scope, the 5x “zoom” 100 yard tick would be 1/5th of the non “zoom” tick. These particular types of scopes are useful for:
- Far away types of shooting where shooters have more time to make ballistic estimations
- Shooting where most shots occur within much shorter distances and ranges
- Shooters who would like a clearer optic picture with less room used up by the enlarged FFP reticle
Zoom for Rifle Optics
The amount of zoom a scope supplies is figured out by the diameter, density, 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 Optic Details
A single power rifle optic uses a zoom number designator like 4×32. This suggests the zoom power of the scope is 4x power and the objective lens is 32mm. The magnification of this kind of optic can not fluctuate because it is a fixed power optic.
Adjustable Power Lens Optic Details
Variable power rifle scopes can be tweaked between magnified settings. The power change is performed by the power ring part of the scope near the back of the scope by the eye bell.
Power and Range
Here are some recommended scope power settings and the distances where they could be successfully used. Highly magnified optics will not be as beneficial as lower powered rifle scope glass due to the fact that too much zoom can be a negative aspect depending on your shooting distance. The same relates to extended ranges where the shooter needs to have increased power to see precisely where to best aim the rifle at the target.
Info on Rifle Glass Lens Finishing
All state-of-the-art rifle optic and scope lenses are coated. Lens finishing can be a vital element of a rifle when looking into high end rifle optics and scope equipment.
HD Versus ED Lens Coatings
Some optic companies also use “HD” or high-def glass coatings which use different procedures, polarizations, rare earth compounds, and aspects to extract different color ranges and viewable target visibility through lenses. This high-def coating is commonly used with higher density glass which reduces light’s potential to refract through the lens glass. Some scope producers use “HD” to refer to “ED” suggesting extra-low dispersion glass. ED deals with how colors are presented on the chroma spectrum and the chromatic aberration or deviance which is also called color distortion or fringing. Chromatic aberration can be obvious around items with hard edges and outlines as light hits the object from various angles.
What to Know About Single Coating Versus Multi-Coating
Various optic lenses can also have various coverings used to them. All lenses usually have at least some type of treatment or covering applied to them prior to being used in a rifle scope or optic.
This lens treatment can safeguard 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 on the scope manufacturer and how much you paid for it.
Some scope producers similarly make it a point to specify if their optic lenses are coated or “multi” coated. Being “better” depends on the maker’s lens treatment innovation and the quality of products used in constructing the rifle scope.
Hydrophobic Lens Finishing
Water on a lens doesn’t assist with maintaining a clear sight picture through a scope at all. Lots of top of the line and military grade optic companies will coat their lenses with a hydrophobic or hydrophilic anti-water finishing.
Choices for Installing Rifle Optics on Long Guns
Installing approaches for scopes can be found in a few choices. There are the basic scope rings which are individually mounted to the scope and one-piece scope mounts which cradle the scope. These various types of mounts also normally can be found in quick release variations which use toss levers which enable rifle shooters to rapidly install and dismount the glass.
Hex Key Scope Ring Mounting Solutions
Standard, clamp design 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 separate rings to support the optic, and are often made from 7075 T6 billet aluminum which is designed for long distance accuracy shooting. This type of scope install is excellent for rifles which need a resilient, rock solid mount which will not move no matter how much the scope is moved or abuse the rifle takes.
Quick-Release Cantilever Rifle Glass Ring Mounting Solutions
These kinds of quick-release rifle scope mounts can be used to rapidly detach a scope from a rifle and reattach it to a different rifle. If they all use a comparable design mount, multiple scopes can also be swapped in the field. The quick detach design is CNC machined from anodized 6061 T6 aluminum and the mounting levers connect nicely to a flat top design Picatinny rail. This allows the scope to be sighted in while on the rifle, removed from the rifle, and remounted while preserving accuracy. These types of mounts come in convenient for rifles which are moved around a lot, to take off the scope from the rifle for protection, or for sight systems which are utilized between several rifles. An example of this mount style is the 30mm mount from the Vortex Optics brand. It normally costs around $250 USD
Info on Glass Tube Sealing and Gas Purging
Moisture inside your rifle optic can mess up a day of shooting and your costly optic by bringing about fogging and producing residue inside of the scope tube. Most scopes avoid moisture from going into the scope tube with a system of sealing O-rings which are water resistant.
Rifle Glass Gas Purging
Another part of avoiding the buildup of wetness inside of the rifle optic tube is filling the tube with a gas like nitrogen. Given that this space is already occupied by the gas, the glass is less altered by temperature alterations and pressure variations from the outside environment which might possibly allow 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.