Last update on May 31, 2023 // Source: Amazon API
Rifle Scope Product Details
Adco Clearfield 1-Inch Diameter Scope 3-9×42
Adco’s t series clearfield scopes offer clear crisp images and a unique reticle design that allows you to make your shot. If high quality and accuracy are the tools you need in your long range plan, consider the scopes from adco. Made to mil-specs, this scope provides precision optics and a sophisticated reticle, to make well placed shots at long distances. The x39 is a 3-9 power scope with a 1 tube and super bright 42mm objective lens. Multicoated optics make this a must have when hunting for objects hidden in the brush.
Rifle Scope Product Features
1-Inch tube design
3-9x 42 scope
Built to mil-spec standards
About the Interstate Arms Corp Brand
Interstate Arms Corp is a premium manufacturer for long gun scopes, optics, mounting solutions, and other components used for firearms like rifles and long guns. They style and make their mounts and related products working with elements which are long lasting and durable. This includes the Adco Clearfield 1-Inch Diameter Scope 3-9×42 by Interstate Arms Corp. For additional shooting products, visit their website.
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 zoom by making use of a set of lenses inside the scope. The scope’s positioning can be dialed in for the consideration of many environmental things like wind and elevation to make up for bullet drop.
The scope’s function is to help the shooter understand precisely where the bullet will land based on the sight picture you are viewing via the scope as you align the scope’s crosshair or reticle with the intended target. Most modern-day rifle optics have about 11 parts which are found internally and externally on the scope body. These optic pieces include the rifle scope’s body, lenses, modification dials, focus rings, and other parts. See all eleven parts of optics.
Rifle Optic Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. Choosing the perfect type of rifle glass is based on what type of shooting you plan on doing.
About First Focal Plane Optics
Focal plane scopes (FFP) include the reticle in front of the magnification lens. These kinds of scopes are beneficial for:
- Quick acquisition, far away kinds of shooting
- Shooting scenarios where computations are very little
- Experienced shooters who have an idea for their target “hold over” and also “lead” correlations for their long gun
- Shooters who don’t mind the reticle is enlarged and requires more visual sight area than a SFP reticle
Second Focal Plane Optics
Second focal plane scopes (SFP) come with the reticle to the rear of the magnifying lens. This causes the reticle to remain at the exact same size in relation to the level of magnification being used. The end result is that the reticle dimensions adjust based upon the magnification employed to shoot over longer distances given that the markings represent different increments which differ with the zoom. In the FFP example with the SFP scope, the 5x “zoom” one hundred yard tick measurement would be 1/5th of the non “zoom” tick measurement. These styles of glass are beneficial for:
- Far away types of shooting where shooters have additional time to make ballistic calculations
- Shooting where most shots take place within shorter ranges and spaces
- Shooters who would like a clearer optic picture with less room used up by the bigger FFP reticle
Magnification for Glass
The amount of magnification a scope supplies is determined by the diameter, thickness, 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 Scopes
A single power rifle optic uses a zoom number designator like 4×32. This implies the zoom power of the scope is 4x power while the objective lens is 32mm. The zoom of this type of optic can not change considering that it is a fixed power optic.
Variable Power Lens Rifle Optics
Variable power rifle scopes use variable power levels. The power modification is accomplished by the power ring part of the scope near the rear of the scope by the eye bell.
Optic Power Level and Range Correlation
Here are some recommended scope powers and the ranges where they can be efficiently used. Bear in mind that higher magnification optics will not be as efficient as lower powered glass due to the fact that too much magnification can be a bad thing. The same idea goes for extended distances where the shooter needs enough power to see precisely where to best aim the rifle.
Lens Finishing for Optics
All modern rifle optic lenses are covered in special coatings. There are different types and qualities of finishings. When considering high end rifle targeting setups, Lens coating can be an important aspect of a rifle. The lenses are one of the most critical components of the glass since they are what your eye looks through while sighting a rifle in on the target. The finishing on the lenses safeguards the lens surface area and also assists with anti glare capabilities from excess natural light and color perception.
HD Versus ED Rifle Scope Lens Coatings
Some scope brands also use “HD” or high-definition lens coatings which use various processes, chemicals, polarizations, and components to draw out a wide range of colors and viewable definition through the lens. Some scope makers use “HD” to refer to “ED” meaning extra-low dispersion glass.
Rifle Glass Lens Single Covering Versus Multi-Coating
Various optic lenses can likewise have different coverings applied to them. All lenses typically have at least some type of treatment or coating applied to them before they are used in a rifle scope or optic.
Single coated lenses have a treatment applied to them which is typically a protective and enhancing multi-purpose treatment. This lens treatment can shield the lens from scratches while lowering glare and other less beneficial things experienced in the shooting environment while sighting in with the optic. The quality of a single layered lens depends on the scope company and how much money you spent on it. Both are signs of the lens quality.
Some scope producers also make it a point to define if their optic lenses are coated or “multi” covered. Being “much better” depends on the producer’s lens treatment technology and the quality of products used in developing the rifle scope.
Hydrophobic Covering for Scopes
Water on a lens doesn’t help with maintaining a clear sight picture through a scope at all. Many top of the line and high-end optic companies will coat their lenses with a hydrophilic or hydrophobic coating which is water repellent.
Rifle Scope Installation Alternatives
Mounting solutions for scopes can be found in a few options. There are the basic scope rings which are separately installed to the optic and one-piece mounts which cradle the scope. These different kinds of mounts also normally are made in quick release versions which use manual levers which allow rifle shooters to rapidly mount and remove the optics.
Hex Key Scope Rings
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 two separate rings to support the optic, and are often made from 7075 T6 billet aluminum which is created for long distance precision shooting. This type of scope install is great for rifles which need a resilient, sound mounting solution which will not move no matter how much the scope is moved or abused.
Quick-Release Cantilever Scope Ring Mounts
These types of quick-release rifle scope mounts can be used to rapidly attach and detach a scope from a rifle before reattaching it to a different rifle. Multiple scopes can also be swapped out if they all use a compatible design mount. These types of mounts come in handy for rifles which are transported a lot, to swap out the optic from the rifle for protecting the scope, or for optics which are used in between numerous rifles or are situationally focused.
Info Around Scope Tube Sealing and Gas Purging
Wetness inside your rifle glass can ruin a day of shooting and your costly optic by inducing fogging and developing residue inside of the scope’s tube. A lot of optics prevent humidity from getting in the optical tube with a series of sealing O-rings which are waterproof. Usually, these water-resistant scopes can be immersed within 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be plenty of moisture prevention for conventional use rifles for hunting and sporting purposes, unless you plan on taking your rifle aboard a watercraft and are worried about the scope still functioning if it goes overboard and you can still recover the firearm.
About Glass Tube Gas Purging
Another part of preventing the buildup of wetness inside of the rifle scope’s tube is filling the tube with a gas like nitrogen. Because this space is currently taken up by the gas, the optic is less influenced by climate alterations and pressure distinctions from the external environment which may potentially enable water vapor to leak in around the seals to fill the vacuum which would otherwise exist. These are good qualities of a decent rifle scope to seek out.