Last update on August 9, 2022 // Source: Amazon API
Rifle Scope Product Details
Swift SRP3901 Scope, Black
The Swift SRP3901 Rifle scope is a 30mm aircraft grade aluminum body tube with T-6 process. Anodized black matte finish. Fully multi coated optics with a speed focus eyepiece system. Illumination reticle system (green and red color 11 step) 2nd Focal plane reticle (3PCH-Dot). Low profile turn turret type. Coil spring system. Made in the USA. Re-enforced self centering reticle. Parallax free at 100 yards. 1/4″ click MOA. BaK7 Schott Glass. Waterproof and shockproof.
Rifle Scope Product Features
30mm Aircraft grade aluminum body tube with T-6 process
Illumination reticle system (green/red color 11 step)
2nd Focal Plane Reticle (3PCH-Dot)
Speed focus eyepiece system
Coil spring system
About the Swift Sport Optics Scope Maker
Swift Sport Optics is a premium company for weapon scopes, optics, mounting solutions, and other accessories used for firearms like rifles and long guns. They style and manufacture their scopes and related products by making the most of elements which are long lasting and durable. This includes the Swift SRP3901 Scope, Black by Swift Sport Optics. For more shooting items, visit their site.
Rifle scopes permit you to exactly aim a rifle at various targets by aligning your eye with the target at range. They accomplish this through magnifying the target by making use of a set of lenses within the scope. The scope’s alignment can be adapted to take into account separate environmental things like wind speed and elevation to account 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 through the optic as you line up the scope’s crosshair or reticle with the target. Many modern-day rifle scopes and optics have about 11 parts which are located within and on the exterior of the scope. These parts consist of the rifle scope’s body, lenses, windage turrets or dials, focus rings, and other components. See all eleven parts of optics.
Rifle Glass Styles
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. The sort of focal plane an optic has identifies where the reticle or crosshair is located in regard to the optic’s magnifying adjustments. It simply implies the reticle is located behind or before the magnification lens of the scope. Picking the best style of rifle optic is based upon what variety of hunting or shooting you anticipate doing.
About First Focal Plane Glass
Focal plane scopes (FFP) feature the reticle in front of the zoom lens. These styles of scopes are beneficial for:
- Quick acquisition, far away types of shooting
- Shooting situations where estimations are marginal
- Experienced shooters who understand their aim point “hold over” and also “lead” ratios for their firearms
- Shooters who don’t mind the reticle is bigger and uses up more visual sight space than a SFP reticle
Info About Second Focal Plane Optics
Second focal plane glass (SFP) include the reticle to the rear of the zoom lens. This induces the reticle to stay at the very same size in relation to the amount of magnification being used. The final result is that the reticle dimensions adjust based on the zoom employed to shoot over lengthier distances considering that the markings represent various increments which differ with the zoom level. In the FFP illustration with the SFP optic, the 5x “zoom” one hundred yard tick would be 1/5th of the non “zoom” tick reticle measurement. These particular kinds of glass are useful for:
- Long distance types of shooting where shooters have extra time to make ballistic estimations
- Shooting where most shots occur within shorter proximities and ranges
- Shooters who choose a clearer optic picture without area used up by the bigger FFP reticle
The amount of zoom a scope offers is figured out by the size, thickness, and curvatures of the lenses inside of the rifle scope. The zoom of the scope is the “power” of the scope.
Single Power Lens Rifle Glass
A single power rifle scope and optic comes with a magnification number designator like 4×32. This indicates the magnification power of the scope is 4x power and the objective lens is 32mm. The magnification of this kind of scope can not change given that it is set from the factory.
Adjustable Power Lens Rifle Scope Details
Variable power rifle scopes can be adjusted between magnification increments. These types of scopes will list the magnification amount in a configuration such as 2-10×32. These numbers indicate the zoom of the scope could be adjusted in between 2x and 10x power. This always includes the power levels in-between 2 and 10. The power shift is accomplished by applying the power ring part of the scope near the back of the scope by the eye bell piece.
Glass Power Level and Ranges
Here are some suggested scope powers and the ranges where they may be effectively used. Remember that higher power optics and scopes will not be as effective as lower powered scope and optics because excessive magnification can be a bad thing. The same concept goes for extended distances where the shooter needs to have increased power to see exactly where to properly aim the rifle.
About Lens Covering
All contemporary rifle optic lenses are covered in special coatings. There are various types and qualities of glass lens finishings. Lens covering is a crucial aspect of a rifle when contemplating luxury rifle optics and scope systems. The glass lenses are among the most significant pieces of the optic as they are what your eye sees through while sighting a rifle in on the target. The finish on the lenses shields the lens surface area as well as improves anti glare from refracted light and color presence.
Info on Rifle Glass Lens Coatings – HD Versus ED
Some rifle scope makers additionally use “HD” or high-definition lens coatings which apply various processes, polarizations, rare earth compounds, and elements to draw out different colors and viewable target visibility through the lens. This HD covering is commonly used with greater density glass which decreases light’s ability to refract by means of the lens glass. Some scope vendors use “HD” to refer to “ED” suggesting extra-low dispersion glass. ED handles how certain colors are represented on the chromatic spectrum and the chromatic aberration which is also called color distortion or fringing. Chromatic aberration may be noticeable over objects with well defined outlines as light hits the item from various angles.
Single Finish Versus Multi-Coating
Different optic lenses can also have various coatings applied to them. All lenses usually have at least some type of treatment or covering applied to them before being used in a rifle scope or optic.
Single layered lenses have a treatment applied to them which is normally a protective and boosting multi-purpose treatment. This lens treatment can preserve the lens from scratches while reducing 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 on the scope maker and how much money you spent paying for it. Both the manufacturer and amount are signs of the lens quality.
Some scope producers likewise make it a point to define if their optic lenses are covered or “multi” coated. This indicates the lens has multiple treatments applied to the surfaces of the glass. If a lens gets multiple treatments, it can show that a company is taking multiple steps to fight various environmental aspects like an anti-glare finishing, a scratch resistant anti-abrasion finish, followed by a hydrophilic coating. This also doesn’t always suggest the multi-coated lens is better than a single covered lens. Being “much better” depends upon the maker’s lens treatment innovation and the quality of products used in building the rifle scope.
Anti-water Lens Finishes
Water on a lens does not assist with preserving a clear sight picture through a scope in any way. Numerous top of the line and high-end scope manufacturers will coat their lenses with a hydrophilic or hydrophobic coating. The Steiner Optics Nano-Protection is a good example of this kind of treatment. It treats the exterior of the Steiner optic lens so the water molecules can not bind to it or develop surface tension. The outcome is that the water beads sheet off of the scope to preserve a clear, water free sight picture.
Optic Installation Alternatives
Mounting options for scopes can be found in a few options. There are the standard scope rings which are separately mounted to the optic and one-piece mounts which cradle the scope. These different types of mounts also usually come in quick release versions which use toss levers which allow rifle operators to rapidly mount and remove the glass.
Scope Mounts with Hex Key Rings
Normal, clamp style 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 a couple of separate rings to support the optic, and are made from 7075 T6 billet aluminum which are developed for long range 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 abused.
Quick-Release Cantilever Rifle Optic Ring Mounts
These types of quick-release rifle scope mounts can be used to quickly take off a scope from a rifle and reattach it to a different rifle. A wide range of scopes can also be switched out if they all use a complementary designed mount. The quick detach design is CNC crafted from anodized 6061 T6 aluminum and the mounting levers attach nicely to a flat top type Picatinny rail. This enables the scope to be sighted in while on the rifle, taken off of the rifle, and remounted back on the rifle while retaining the original sighting settings. These kinds of mounts come in beneficial for rifles which are transferred a lot, to take off the optic from the rifle for protection, or for optics which are employed between a number of rifles. An example of this mount type is the 30mm mount from the Vortex Optics brand. It generally costs around $250 USD
Sealing and Gas Purging for Optic Tubes
Moisture inside your rifle optic can destroy a day of shooting and your expensive optic by triggering fogging and developing residue inside of the scope tube. Most scopes prevent moisture from getting in the scope tube with a system of sealing O-rings which are water resistant.
Gas Purged Scope Tubes
Another part of avoiding the buildup of moisture inside of the rifle scope’s tube is filling the tube with a gas like nitrogen. Since this area is already occupied by the gas, the scope is less altered by condition shifts and pressure variations from the external environment which may possibly permit water vapor to seep in around the seals to fill the void which would otherwise exist. These are good qualities of a decent rifle scope to seek out.