Description
Rifle Scope Product Details
Chinoook 3-9X40 Hunting Rifle Scope Sight Optics R4 Reticle Crosshair + Free Mount
Description:
Tactical 3-9X40 Rifle Scope Sight
Magnification:3-9(X)
Objective lens diameter:40(mm)
Tube diameter:25.4(mm)
Exit Pupildiameter):13-4.4(mm)
Eye Relief:80(mm)
Maximum Moving Dimension:90(MOA)
Length:330(mm)
Mount: Free 2 x 20mm mounts
Package :
1x 3-9X40 Rifle Scope Sight
2x 20mm Rail mounts
Now some competitor give us unverified hostile review. We promised that your purchase are in warranty and you can request replacement and refund.
Now some competitor give us unverified hostile review. We promised that your purchase are in warranty and you can request replacement and refund.
If you have any problem with your purchase,please send us message and you will get an answer in 24 hours and Hope you can enjoy your purchase
Rifle Scope Product Features
Magnification: 3-9x
Free 2x 20mm Rail mounts
Easy Grip Target-style Windage and Elevation Adjustments
Frog /Shock Resistant
About the Chinoook Manufacturer
Chinoook is a premium maker for rifle scopes, optics, mounting solutions, and other accessories used for guns like rifles and long guns. They innovate and build their mounts and related products working with building materials which are durable and long lasting. This includes the Chinoook 3-9X40 Hunting Rifle Scope Sight Optics R4 Reticle Crosshair + Free Mount by Chinoook. For additional shooting goods, visit their site.
Optic Facts
Rifle scopes allow you to exactly aim a rifle at various targets by lining up your eye with the target at range. They do this through zoom by making use of a set of lenses inside the scope. The scope’s positioning can be adjusted to take into account many environmental factors like wind and elevation decreases to account for bullet drop.
The scope’s function is to understand precisely where the bullet will hit based upon the sight picture you are seeing with 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 internally and externally on the scope body. These optic pieces include the rifle scope’s body, lenses, elevation turrets, objective focus rings, and other parts. See all eleven parts of an optic.
About Rifle Scope Styles
Rifle scopes can be either “first focal plane” or “second focal plane” kind of scopes. The form of focal plane a scope has determines where the reticle or crosshair is located relative to the scopes magnifying adjustments. It actually indicates the reticle is behind or in front of the magnification lens of the scope. Picking out the most desired kind of rifle optic is based upon what type of shooting you intend on undertaking.
First Focal Plane Glass
Focal plane scopes (FFP) feature the reticle in front of the magnification lens. This triggers the reticle to increase in size based upon the level of zoom 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 instance, one tick on a mil-dot reticle at 100 yards with no “zoom” is still the same tick at one hundred yards using 5x “zoom”. These kinds of scopes work for:
- Quick acquisition, long distance types of shooting
- Shooting situations where estimations are small
- Experienced shooters who have an idea for their aim point “hold over” and “lead” equations for their long guns
- Shooters who do not mind the reticle is enlarged and uses up more visual sight space than a SFP reticle
Info About Second Focal Plane Scopes
Second focal plane scopes (SFP) include the reticle to the rear of the zoom lens. In the FFP example with the SFP scope, the 5x “zoom” one hundred yard tick reticle measurement would be 1/5th of the non “zoom” tick measurement.
- Far away types of shooting where shooters have more time to make ballistic estimations
- Shooting where most of the shots happen within shorter distances and ranges
- Shooters who select a clearer optic picture without space taken up by the enlarged FFP reticle
Rifle Optic Zoom
The amount of magnification a scope offers is identified 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.
About Fixed Power Lens Rifle Scopes
A single power rifle optic or scope uses a magnification number designator like 4×32. This indicates the magnification power of the scope is 4x power while the objective lens is 32mm. The zoom of this kind of optic can not adjust because it is set from the factory.
Variable Power Lens Glass Facts
Variable power rifle scopes use variable power levels. The power modification is handled using the power ring part of the scope near the back of the scope by the eye bell.
The Power and Range of Glass
Here are some recommended scope power settings and the ranges where they can be successfully used. Keep in mind that higher magnification optics will not be as effective as lower magnification level scopes due to the fact that increased zoom can be a negative thing in certain situations. The exact same idea goes for longer distances where the shooter needs enough power to see exactly where to best aim the rifle.
Lens Finishing for Rifle Scopes
All modern-day rifle optic lenses are coated. There are different types and qualities of finishes. Lens finishing is a crucial aspect of a rifle when considering high-end rifle optics and scope systems. The lenses are among the most key parts of the glass as they are what your eye sees through while sighting a rifle in on the target. The covering on the lenses offers protection to the lens surface area and even helps with anti glare from excess sunrays and color profiles.
HD Versus ED Lenses
Some rifle glass companies also use “HD” or high-def lense finishes that use different procedures, aspects, polarizations, and chemicals to enhance separate color ranges and viewable target visibility through the lens. This HD coating is commonly used with higher density lens glass which decreases light’s capability to refract through the lens glass. Some scope producers use “HD” to refer to “ED” suggesting extra-low dispersion glass. ED handles how colors are represented on the chroma spectrum and the chromatic aberration or deviance which is also called color distortion or fringing. Chromatic aberration is often obvious around items with defined shapes as light hits the item from specific angles.
Details on Single Finishing Versus Multi-Coating
Various optic lenses can also have various coatings applied to them. All lenses typically have at least some type of treatment or covering applied to them before they are used in a rifle scope or optic.
Single covered lenses have a treatment applied to them which is usually a protective and improving multi-purpose treatment. This lens treatment can shield the lens from scratches while reducing glare and other less helpful things experienced in the shooting environment while sighting in with the optic. The quality of a single coated lens depends on the scope developer and just how much you spent paying for it. Both the make and cost are signs of the lens quality.
Some scope producers also make it a point to define if their optic lenses are layered or “multi” covered. This indicates the lens has multiple treatments applied to the surfaces of the glass. If a lens receives multiple treatments, it can show that a company is taking numerous steps to combat different natural aspects like an anti-glare coating, a scratch resistant anti-abrasion coating, followed by a hydrophilic covering. This also does not necessarily indicate the multi-coated lens will perform much better than a single layered lens. Being “better” is dependent on the producer’s lens treatment solutions and the quality of materials used in creating the rifle scope.
Hydrophobic Rifle Scope Lens Covering
Water on a lens does not help with preserving a clear sight picture through a scope at all. Lots of top of the line and military grade scope companies will coat their lenses with a hydrophilic or hydrophobic finish.
Options for Installing Rifle Scopes on Long Guns
Installing approaches for scopes can be found in a few choices. There are the standard scope rings which are individually installed to the optic and one-piece scope mounts which cradle the scope. These various kinds of mounts also usually are made in quick release variations which use manual levers which allow rifle shooters to quickly mount and dismount the scope.
Hex Key Rifle Optic Ring Mounts
Standard, clamp design mounting scope rings use hex head screws to position to the flattop design Picatinny scope mounting rails on the tops of rifles. These styles of scope mounts use a pair of individual rings to support the scope, and are normally made from 7075 T6 billet aluminum or similar materials which are developed for long distance precision shooting. This kind of scope mount is effective for rifle systems which need to have a resilient, unfailing mount which will not shift despite just how much the scope is moved about or abuse the rifle takes. These are the design of mounts you really want to have for a devoted scope system on a reach out and touch someone scouting or hard target interdiction long gun that will hardly ever need to be altered or recalibrated. Blue 242 Loctite threadlocker can additionally be used on screws to keep the hex screws from wiggling out after they are mounted firmly in place. An example of these rings are the 30mm type from the Vortex Optics brand. The set normally costs around $200 USD
Rifle Optic Mounts with Quick-Release Cantilever Rings
These types of quick-release rifle scope mounts can be used to quickly attach and remove a scope from a rifle before reattaching it to a different rifle. Numerous scopes can also be switched out if they all use a similar design mount. These types of mounts are convenient for rifles which are carried a lot, to remove the optic from the rifle for protecting the scope, or for scopes which are used between numerous rifles.
Info Around Rifle Glass Tube Sealing and Gas Purging
Wetness inside your rifle scope can ruin a day on the range and your costly optic by inducing fogging and making residue within the scope’s tube. Many optics prevent moisture from getting in the optical tube with a series of sealing O-rings which are water resistant. Normally, these water resistant scopes can be immersed under 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be ample moisture content prevention for standard use rifles for hunting and sporting purposes, unless you plan on taking your rifle on boats and are concerned about the optic still performing if it goes over the side and you can still recover the rifle.
Gas Purged Scope Tubes
Another component of avoiding the buildup of moisture inside of the rifle optic tube is filling the tube with a gas like nitrogen. Since this area is currently taken up by the gas, the glass is less impacted by temperature level alterations and pressure variations from the outdoor environment which could potentially enable water vapor to leak in around the seals to fill the void which would otherwise exist. These are good qualities of a decent rifle scope to seek out.
