Description
Rifle Scope Product Details
NightStar 2.5-15X50SFIR
Elegant package! Latest technoloty made the scope more sharger, with Integrated side focus and intensity knob make it more fasionable, comb sunshade filter included Model 2.5-15X50 Power 2.5-15X Objective diameter(mm) 50 Eye Exit Pupilmm 18-3.3 Tube diameter(mm) 30 Lengthmm) 340 Weight(g) 660g Nearest focus range(Y) 25 Parallax type Side Focus Coated Optics Fully Multicoated FOV(ft@10yds) 43.7-7.3 windage range(MOA) 50 Elevation range(MOA) 50 Click value 0.1MIL Structure One piece tube Waterproof(Y/N) Y Fog proof (Y/N) Y Shockproof(y/N) Y
Rifle Scope Product Features
Integrated parallux and intensity knob, fully multicoated lens, 6x variation
About the NightStar Manufacturer
NightStar is a premium manufacturer for firearm scopes, optics, mounting solutions, and other components used for guns like rifles and long guns. They style and supply their products choosing materials which are resilient and long lasting. This includes the NightStar 2.5-15X50SFIR by NightStar. For more shooting items, visit their website.
Info Rifle Glass
Rifle scopes allow you to precisely align a rifle at various targets by lining up your eye with the target over a distance. They accomplish this through magnification using a set of lenses inside the scope. The scope’s positioning can be adapted to account for numerous environmental aspects like wind speed and elevation decreases to make up for bullet drop.
The scope’s purpose is to help the shooter understand exactly where the bullet will land based upon the sight picture you are seeing through the optic as you line up the scope’s crosshair or reticle with the intended point of impact. Many contemporary rifle optics have about eleven parts which are found inside and on the exterior of the optic. These parts include the rifle scope’s body, lenses, windage and elevation dials or turrets, focus rings, and other parts. See all eleven parts of an optic.
The Types of Rifle Scopes
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. The type of focal plane a scope has identifies where the reticle or crosshair lies relative to the scopes magnifying adjustments. It simply indicates the reticle is behind or before the magnification lens of the scope. Looking for the most beneficial type of rifle glass is based on what kind of shooting or hunting you plan on doing.
First Focal Plane Scopes
Focal plane scopes (FFP) feature the reticle in front of the magnification lens. These types of scopes are helpful for:
- Quick acquisition, far away types of shooting
- Shooting scenarios where estimations are marginal
- Experienced shooters who have an idea for their aim point “hold over” and also “lead” relationships for their weapon
- Shooters who don’t mind the reticle is bigger and uses up more visual eyesight room than a SFP reticle
Second Focal Plane Scopes
Second focal plane scopes (SFP) feature the reticle behind 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 reticle measurement.
- Far away kinds of shooting where shooters have more time to make ballistic computations
- Shooting where most shots happen within much shorter proximities and ranges
- Shooters who choose a clearer optic picture without area used up by the larger size FFP reticle
Magnification for Scopes
The amount of scope zoom you need on your scope depends upon the type of shooting you desire to do. Practically every kind of rifle scope offers some degree of magnification. The volume of magnification a scope provides is identified by the size, density, and curves of the lens glass inside of the rifle scope. The magnification level of the scope is the “power” of the scope. This indicates what the shooter is observing through the scope is magnified times the power aspect of what can typically be seen by human eyes.
Fixed Power Lens Glass Info
A single power rifle optic and scope uses a magnification number designator like 4×32. This suggests the magnification power of the scope is 4x power while the objective lens is 32mm. The magnification of this kind of optic can not fluctuate since it is fixed.
Variable Power Lens Glass Details
Variable power rifle scopes can be adjusted between magnification increments. These types of scopes will list the magnification degree in a configuration like 2-10×32. These numbers suggest the zoom of the scope could be adjusted in between 2x and 10x power. This always incorporates the powers in-between 2 and 10. The power modification is accomplished by working with the power ring component of the scope near the rear of the scope by the eye bell piece.
The Power Level and Range of Rifle Scopes
Here are some suggested scope power levels and the ranges where they can be successfully used. Remember that higher power glass will not be as practical as lower powered optics and scopes because too much magnification can be a bad thing. The same idea relates to extended ranges where the shooter needs to have enough power to see where to best aim the rifle.
About Lens Coatings
All current rifle scope and optic lenses are coated. Lens finish can be a vital aspect of a shooting platform when thinking about high end rifle optics and scope systems.
HD Versus ED Lens Coatings
Some rifle scope companies will also use “HD” or high-definition glass coverings that use different processes, aspects, chemicals, and polarizations to extract various color ranges and viewable definition through the lens. This high-definition coating is typically used with more costly, high density lens glass which brings down light’s ability to refract through the lens glass. Some scope suppliers use “HD” to refer to “ED” meaning extra-low dispersion glass. ED handles how colors are presented on the chromatic spectrum and the chromatic difference or aberration which is similarly called color distortion or fringing. Chromatic aberration may be obvious around items with well defined outlines as light hits the object from particular angles.
Single Scope Lens Coating Versus Multi-Coating
Various optic lenses can likewise have different finishes applied to them. All lenses typically have at least some type of treatment or finishing applied to them before being used in a rifle scope or optic.
This lens treatment can safeguard the lens from scratches while lowering glare and other less advantageous things experienced in the shooting environment while sighting in with the scope. The quality of a single layered lens depends on the scope producer and how much you paid for it.
Some scope producers also make it a point to specify if their optic lenses are covered or “multi” covered. Being “much better” depends on the maker’s lens treatment innovation and the quality of materials used in constructing the rifle scope.
Anti-water Lens Covering
Water on a lens does not improve keeping a clear sight picture through a scope in any way. Many top of the line and premium optic producers will coat their lenses with a hydrophilic or hydrophobic finishing. The Steiner Optics Nano-Protection is a fine example of this kind of treatment. It treats the surface area of the Steiner optic lens so the H2O molecules can not bind to it or develop surface tension. The outcome is that the water beads slide off of the scope to maintain a clear, water free sight picture.
Alternatives for Mounting Optics on Long Guns
Mounting options for scopes come in a few options. There are the basic scope rings which are individually installed to the optic and one-piece scope mounts which cradle the scope. These different types of mounts also generally are made in quick release variations which use toss levers which allow rifle operators to rapidly mount and remove the scope.
Hex Key Optic Ring Mounts
Basic, clamp design mounting scope rings use hex head screws to position to the flattop style Picatinny scope mounting rails on the tops of rifles. These styles of scope mounts use double separate rings to support the scope, and are usually constructed from 7075 T6 billet aluminum which are manufactured for long distance accuracy shooting. This type of scope mount is great for rifles which need a resilient, rock solid mount which will not move despite how much the scope is moved about or jarring the rifle takes. These are the design of mounts you should get for a devoted optics setup on a reach out and touch someone scouting or interdiction long gun which will rarely need to be altered or recalibrated. Blue 242 Loctite threadlocker can also be used on the screws to prevent the hex screws from wiggling out after they are installed safely in place. An example of these rings are the 30mm style from the Vortex Optics company. The set generally costs around $200 USD
Quick-Release Cantilever Rifle Glass Ring Mounts
These types of quick-release rifle scope mounts can be used to quickly attach and remove a scope from a rifle. If they all use a comparable style mount, multiple scopes can also be switched out on the range. The quick detach mount style is CNC crafted from anodized 6061 T6 aluminum and the mounting levers fasten tightly to a flat top type Picatinny rail. This enables the scope to be sighted in while on the rifle, removed from the rifle, and remounted while maintaining precision. These types of mounts are useful and beneficial for shooting platforms which are moved around a lot, to take off the scope from the rifle for protection, or for sight systems which are utilized between multiple rifles. An example of this mount style is the 30mm mount from Vortex Optics. It normally costs around $250 USD
Sealing and Gas Purging for Optic Tubes
Wetness inside your rifle optic can ruin a day on the range and your highly-priced optic by causing fogging and developing residue within the scope tube. Many scopes protect against wetness from entering the optical tube with a system of sealing O-rings which are waterproof. Generally, 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 sufficient wetness avoidance for conventional use rifles, unless you anticipate taking your rifle on a boat and are worried about the scope still performing if it is submerged in water and you can still retrieve the rifle.
Rifle Scope Gas Purging
Another part of avoiding the accumulation of wetness inside of the rifle scope’s tube is filling the tube with a gas like nitrogen. Since this area is currently occupied by the gas, the glass is less affected by temperature level shifts and pressure distinctions from the outdoor environment which could possibly 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 look for.
