Description
Rifle Scope Product Details
Feyachi RFS-18 Tactical Rifle Scope 3-9×40 Rangefinder Red & Green Illuminated Reticle Optics Hunting Scope 1 Inch Tube
Rifle Scope Product Features
About this item
Built on True Strength Platform, Completely O-ring Sealed and Nitrogen Filled ensures outstanding water and fog-proof performance
Two modes Illumination color: Red and Green Illumination,5 levels brightness adjustment,3-9x magnification,40mm Objective lens
Windage & Elevation click value: 1/4 MOA 1/4″ @ 100yards, Tool-free click instruction adjustment
Field of view: 14″-25″@100yards, 2-3″ Eye relief , Fast-focus eyepiece the rangefinder reticle is good for hunting/shooting at varying ranges
Fully Multi-coated Lenses: Fully Multicoated Lens Coatings Increase Light Transmission for the Brightness you need in Low-light Conditions.
Feyachi 3-9×40 BDC Red & Green Illuminated Reticle Rifle Scope
3-9x Magnification, 40mm Objective Lens
Fully Multi-coated Lenses
1/4 MOA Windage & Elevation Click Value
Completely O-ring Sealed and Nitrogen Filled
Red and Green Illumination
5 Levels Brightness Adjustment
Rangefinder Reticle
Red & Green Illuminated Rangefinder Reticle
5 Levels Brightness Adjustment
E/W Adjustment
Windage & Elevation click value: 1/4 MOA 1/4″ @ 100yards, Tool-free click instruction adjustment
Fully Multi-coated Lenses
Fully Multicoated Lens Coatings Increase Light Transmission for the Brightness you need in Low-light Conditions
Specification
Tube Diameter: 25mm
Adjustment Click Value: 1/4 MOA
Adjustment Type: Click
Lens Coating: Fully multicoated
Magnification: 3-9x
Illuminated Reticle: Yes
Battery Type: CR2032
Waterproof:Yes
Fogproof: Yes
Shockproof: Yes
Objective Bell Diameter: 40mm
Ocular Bell Diameter: 40mm
Eye Relief: 2-3”
Exit Pupil Diameter: 4.4mm
Weight: 13.5oz
About the Feyachi Manufacturer
Feyachi is a premium maker for rifle scopes, optics, mounts, and other accessories used for firearms like rifles and long guns. They create and supply their scopes and related products by using elements which are long lasting and durable. This includes the Feyachi RFS-18 Tactical Rifle Scope 3-9×40 Rangefinder Red & Green Illuminated Reticle Optics Hunting Scope 1 Inch Tube by Feyachi. For additional shooting items, visit their site.
Scope Details
Rifle scopes permit you to specifically aim a rifle at different targets by lining up your eye with the target over a distance. They accomplish this through magnifying the target by utilizing a set of lenses inside the scope. The scope’s positioning can be adjusted for the consideration of varied natural things like wind speed and elevation decreases to make up for bullet drop.
The scope’s function is to understand precisely where the bullet will land based on the sight picture you are viewing via the scope as you line up the scope’s crosshair or reticle with the target. Many modern rifle optics have around 11 parts which are located internally and on the exterior of the optic. These optic pieces include the rifle scope’s body, lenses, windage dials or turrets, objective focus rings, and other components. Learn about the eleven parts of optics.
The Types of Rifle Scopes
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. Selecting the finest type of rifle scope is based on what type of shooting you plan on doing.
First Focal Plane Optic Info
First focal plane scopes (FFP) feature the reticle ahead of the magnifying lens. This induces the reticle to increase in size based upon the amount of magnification being used. The benefit is that the reticle measurements are the same at the amplified distance as they are at the non amplified range. For example, one tick on a mil-dot reticle at 100 yards without “zoom” is still the same tick at 100 yards using 5x “zoom”. These kinds of scopes work for:
- Quick acquisition, long distance kinds of shooting
- Shooting situations where estimations are minimal
- Experienced shooters who have an idea for their target “hold over” as well as “lead” ratios for their weapon
- Shooters who don’t mind the reticle is bigger and occupies more visual sight area than a SFP reticle
About Second Focal Plane Optics
Second focal plane scopes (SFP) come with the reticle to the rear of the magnification lens. In the FFP example with the SFP scope, the 5x “zoom” 100 yard tick reticle measurement would be 1/5th of the non “zoom” tick.
- Long distance kinds of shooting where shooters have more time to make ballistic estimations
- Shooting where most of the shots occur within much shorter ranges and proximities
- Shooters who prefer a clearer optic picture with less room taken up by the larger size FFP reticle
About Optic Zoom
The measure of scope magnification you need depends upon the sort of shooting you plan to do. Virtually every style of rifle optic delivers some degree of magnification. The quantity of zoom a scope offers is determined by the dimension, thickness, and curves of the lens glass inside of the rifle optic. The magnifying level of the optic is the “power” of the opic. This indicates what the shooter is looking at through the scope is magnified times the power aspect of what can generally be seen by human eyes.
Single Power Lens Rifle Scopes
A single power rifle optic will have a magnification number designator like 4×32. This means the zoom power of the scope is 4x power while the objective lens is 32mm. The zoom of this type of scope can not change since it is a fixed power scope.
Variable Power Lens Rifle Glass Info
Variable power rifle scopes use variable power levels. The power change is accomplished by using the power ring part of the scope near the rear of the scope by the eye bell.
The Power and Range of Optics
Here are some suggested scope power settings and the ranges where they could be efficiently used. Always remember that higher power glass will not be as effective as lower powered scope and optics since increased zoom can be a detractor. The exact same concept applies to extended ranges where the shooter needs to have sufficient power to see precisely where to best aim the rifle at the target.
Rifle Optic Lens Finish
All cutting-edge rifle scope and optic lenses are coated. Lens finishing is an important aspect of a shooting system when looking into high end rifle optics and scope setups.
HD Versus ED Lenses
Some scope suppliers also use “HD” or high-definition glass coverings which take advantage of different processes, rare earth compounds, elements, and polarizations to extract different color ranges and viewable target visibility through the lens. This high-definition finishing is normally used with increased density lens glass which brings down light’s ability to refract through the lens glass. Some scope vendors use “HD” to describe “ED” implying extra-low dispersion glass. ED deals with how colors are presented on the chroma spectrum and the chromatic aberration or difference which is also called color distortion or fringing. Chromatic aberration is often obvious over items with defined outlines as light hits the item from certain angles.
Single Rifle Glass Lens Finishing Versus Multi-Coating
Different optic lenses can also have different coatings applied to them. All lenses generally have at least some type of treatment or covering applied to them before they are used in a rifle scope or optic. Because the lens isn’t just a raw piece of glass, they require performance enhancing coatings. It becomes part of the carefully tuned optic. It requires a coating to be applied to it so that it will be optimally usable in lots of types of environments, degrees of light (full light VS shaded), and other shooting conditions.
Single coated lenses have a treatment applied to them which is typically a protective and boosting multi-purpose treatment. This lens treatment can protect the lens from scratches while decreasing glare and other less beneficial things experienced in the shooting environment while sighting in with the optic. The quality of a single coated lens depends upon the scope designer and the amount you spent for it. The scope’s maker and cost are indications of the lens quality.
Some scope manufacturers also make it a point to specify if their optic lenses are layered or “multi” coated. This suggests the lens has had numerous treatments applied to the surfaces of the glass. If a lens gets multiple treatments, it can prove that a maker is taking several actions to combat different natural aspects like an anti-glare coating, a scratch resistant anti-abrasion covering, followed by a hydrophilic covering. This also doesn’t always suggest the multi-coated lens will perform better than a single coated lens. Being “much better” depends on the maker’s lens treatment techniques and the quality of glass used in creating the rifle optic.
Rifle Scope Lens Anti-water Coating
Water on a lens doesn’t help with keeping a clear sight picture through a scope at all. Numerous top of the line and military grade optic makers will coat their lenses with a hydrophilic or hydrophobic finish.
Choices for Installing Glass on Long Guns
Mounting solutions for scopes can be found in a few choices. There are the standard scope rings which are individually mounted to the scope and one-piece mounts which cradle the scope. These various types of mounts also typically are made in quick release versions which use throw levers which enable rifle shooters to quickly mount and dismount the scope.
Optic Mounting Solutions with Hex Key Rings
Standard, clamp style mounting scope rings use hex head screws to mount to the flattop design Picatinny scope mount rails on rifles. These types of scope mounts use two separate rings to support the optic, and are made from 7075 T6 billet aluminum which is created for long distance precision shooting. This type of scope install is excellent for rifles which require a durable, sound mount which will not move no matter how much the scope is moved or abused.
Quick-Release Cantilever Optic Ring Mounting Solutions
These kinds of quick-release rifle scope mounts can be used to quickly connect and detach a scope from a rifle. Multiple scopes can also be swapped out if they all use a complementary designed mount. The quick detach mount style is CNC machined from anodized 6061 T6 aluminum and the mounting levers fasten nicely to a flat top type Picatinny rail. This allows the scope to be sighted in while on the rifle, removed from the rifle, and remounted back on the rifle while preserving precision. These kinds of mounts are useful and convenient for rifles which are transferred between vehicles a lot, to remove the scope glass from the rifle for protection, or for scopes which are used between multiple rifles. An example of this mount style is the 30mm mount from Vortex Optics. It generally costs around $250 USD
Glass Tube Sealing and Gas Purging
Wetness inside your rifle glass can wreck a day on the range and your expensive optic by triggering fogging and making residue inside of the scope tube. Most optics protect against wetness from getting in the scope tube with a series of sealing O-rings which are water resistant. Generally, these scopes can be submerged within 20 or 30 feet of water before the water pressure can push moisture past the O-rings. This should be more than enough humidity prevention for conventional use rifles for hunting and sporting purposes, unless you plan on taking your rifle sailing and are concerned about the optic still working if it goes overboard and you can still recover the rifle.
Rifle Optic Gas Purging
Another element of preventing the accumulation of wetness within the rifle scope tube is filling the tube with a gas like nitrogen. Because this area is currently occupied by the gas, the scope is less impacted by temp changes and pressure distinctions from the outdoor environment which could possibly enable water vapor to leak in around the seals to fill the void which would otherwise be there. These are good qualities of a good rifle scope to seek out.
