Last update on July 5, 2022 // Source: Amazon API
Rifle Scope Product Details
Sutekus Tactical Scope 3-9×40 Rangefinder Red & Green Illuminated Optics Reticle Crosshair Scope with 0.79″(20mm) Free Mounts
Rifle Scope Product Features
Specification: Magnification: 3x-9x, Objective Diameter: 1.57″/40mm, Exit pupil: 0.17″-0.52″, Scope Length: 12.8″.
Green and red illuminations, 5-level brightness available.
Field of view: 14′-25′ @ 100yards; windage & elevation click value: 1/4 MOA 1/4″ @ 100yards, 2.7″-3.3″ eye relief.
Two 1” complementary scope rings to be easily mounted onto any 20mm Picatinny or Weaver mount rails.
Suitable for paintball air soft survival game. Warranty period: 180 days since purchased from Sutekus.
Sutekus Rifle Scope: 3 – 9 x 40 EG
Red, green, 2 colors, 5 stages illumination
The reticle is cross shaped,
It is a simple form.
Red, green 2 colors. Adjustable in five stages illumination mounted,
you can see clearly even in dark places.
3 to 9 times variable zoom
It covers enough distance for airgun shooting.
Instructions for use
It takes 7 to 8 cm from the eye to the lens during use.
If the distance is too close or too far, the viewing range will be narrowed or affected by sharpness.
About the Sutekus Company
Sutekus is a premium maker for rifle scopes, optics, mounting solutions, and other components used for guns like rifles and long guns. They innovate and make their products choosing elements which are durable and long lasting. This includes the Sutekus Tactical Scope 3-9×40 Rangefinder Red & Green Illuminated Optics Reticle Crosshair Scope with 0.79″(20mm) Free Mounts by Sutekus. For more shooting products, visit their site.
Rifle scopes allow you to precisely align a rifle at various targets by lining up your eye with the target over a distance. They do this through magnifying the target by utilizing a series of lenses within the scope. The scope’s positioning can be adapted to account for separate ecological things like wind and elevation decreases to account for bullet drop.
The scope’s function is to help shooters understand exactly where the bullet will hit based on the sight picture you are seeing through the optic as you line up the scope’s crosshair or reticle with the intended target. The majority of modern-day rifle scopes have about 11 parts which are located within and outside of the optic. These scope parts include the rifle scope’s body, lenses, elevation dials or turrets, objective focus rings, and other parts. See all eleven parts of a scope.
Rifle Scope Types
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. The style of focal plane a scope has identifies where the reticle or crosshair lies relative to the optic’s zoom. It literally indicates the reticle is behind or ahead of the magnifying lens of the scope. Looking for the most suitable style of rifle scope depends upon what style of shooting you plan on doing.
Info on First Focal Plane Glass
First focal plane glass (FFP) include the reticle ahead of the magnifying lens. This triggers the reticle to increase in size based upon the amount of magnification being used. The result is that the reticle measurements are the same at the enhanced range as they are at the non amplified range. One tick on a mil-dot reticle at 100 yards with no “zoom” is still the very same tick at one hundred yards by using 5x “zoom”. These types of scopes are beneficial for:
- Quick acquisition, far away kinds of shooting
- Shooting situations where calculations are very little
- Experienced shooters who know their target “hold over” as well as “lead” relationships for their weapon
- Shooters who do not mind the reticle is enlarged and takes up more visual eyesight area than a SFP reticle
About Second Focal Plane Optics
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 would be 1/5th of the non “zoom” tick.
- Far away forms of shooting where shooters have additional time to make ballistic calculations
- Shooting where most shots happen within shorter ranges and spaces
- Shooters who desire a clearer optic sight picture with less room taken up by the larger sized FFP reticle
Details on Optic Magnification
The amount of magnification a scope provides is identified by the size, thickness, and curvatures of the lenses inside of the rifle scope. The magnification of the scope is the “power” of the scope.
Single Power Lens Optics
A single power rifle optic or scope will have a magnification number designator like 4×32. This indicates the zoom power of the scope is 4x power and the objective lens is 32mm. The magnification of this kind of scope can not change considering that it is a set power scope.
Adjustable Power Lens Rifle Glass
Variable power rifle scopes use variable power levels. The power adjustment is achieved by using the power ring part of the scope near the rear of the scope by the eye bell.
Rifle Glass Power and Ranges
Here are some advised scope power levels and the distances where they can be effectively used. Highly magnified scopes will not be as efficient as lower magnification level scopes since too much zoom can be a bad thing. The very same idea goes for extended distances where the shooter needs sufficient power to see where to best aim the rifle.
Optic Lens Finish
All cutting-edge rifle optic lenses are coated. Lens finishing is an essential element of a rifle system when thinking about high end rifle optics and scope systems.
ED Versus HD Rifle Glass
Some scope suppliers additionally use “HD” or high-definition lense finishes which apply different processes, chemical applications, polarizations, and elements to extract numerous color ranges and viewable target definition through the lens. This high-definition finish is often used with more costly, high density glass which reduces light’s opportunity to refract through the lens glass. Some scope producers use “HD” to describe “ED” meaning extra-low dispersion glass. ED deals with how colors are presented on the chroma spectrum and the chromatic deviance or aberration which is similarly called color distortion or fringing. Chromatic aberration can be obvious over objects with hard shapes as light hits the object from particular angles.
Glass Lens Single Finish Versus Multi-Coating
Different scope lenses can even have different coverings applied to them. All lenses generally have at least some type of treatment or coating applied to them prior to being used in a rifle scope or optic. Because the lens isn’t just a raw piece of glass, they require performance enhancing coatings. It is part of the finely tuned optic. It needs to have a finish applied to it so that it will be optimally functional in lots of kinds of environments, degrees of light (full light VS shade), and other shooting conditions.
Single covered lenses have a treatment applied to them which is generally a protective and improving multi-purpose treatment. This lens treatment can shield the lens from scratches while decreasing glare and other less helpful things experienced in the shooting environment while sighting in with the optic. The quality of a single covered lens depends upon the scope manufacturer and how much money you spent for it. Both are indications of the lens quality.
Some scope producers similarly make it a point to specify if their optic lenses are coated or “multi” coated. Being “much better” depends on the maker’s lens treatment technology and the quality of materials used in building the rifle scope.
Info on Anti-water Finish
Water on a lens doesn’t assist with preserving a clear sight picture through a scope at all. Many top of the line and military grade optic companies will coat their lenses with a hydrophobic or hydrophilic anti-water finish.
Rifle Glass Installing Choices
Mounting approaches for scopes are available in a few options. There are the standard scope rings which are individually mounted to the scope and one-piece mounts which cradle the scope. These different kinds of mounts also generally can be found in quick release variations which use toss levers which permit rifle shooters to rapidly install and remove the scope.
Hex Key Rifle Optic Ring Mounting Solutions
Standard, clamp design mounting scope rings use hex head screws to mount to the flattop style 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 are developed for long distance accuracy shooting. This type of scope install is fine for rifles which need a long lasting, rock solid mounting solution which will not move no matter how much the scope is moved or abused.
Quick-Release Cantilever Glass Rings
These kinds of quick-release rifle scope mounts can be used to rapidly connect and remove a scope from a rifle. Several scopes can also be swapped out if they all use a complementary style mount. The quick detach design is CNC crafted from anodized 6061 T6 aluminum and the mounting levers attach solidly to a flat top design Picatinny rail. This enables the scope to be sighted in while on the rifle, removed from the rifle, and remounted back on the rifle while retaining precision. These types of mounts are useful and beneficial for rifles which are moved around a lot, to take off the glass from the rifle for protection, or for aiming systems which are utilized between several rifles. An example of this mount type is the 30mm mount designed by the Vortex Optics brand. It usually costs around $250 USD
Glass Tube Sealing and Gas Purging
Moisture inside your rifle optic can destroy a day on the range and your expensive optic by causing fogging and creating residue inside of the scope tube. The majority of optics protect against humidity from entering the scope tube with a series of sealing O-rings which are waterproof. Normally, these scopes can be submerged under 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be ample moisture avoidance for conventional use rifles, unless you anticipate taking your rifle aboard watercrafts and are concerned about the scope still performing if it goes over the side and you can still find the rifle.
Gas Purged Optic Tubes
Another part of preventing the buildup of wetness inside of the rifle optic’s tube is filling the tube with a gas like nitrogen. Because this space is already taken up by the gas, the optic is less altered by temperature level alterations and pressure distinctions from the outside environment which might potentially allow water vapor to leak in around the seals to fill the void which would otherwise be there. These are good qualities of a decent rifle scope to seek out.