Description
Rifle Scope Product Details
Swift ST7904 Premier Tactical Riflescope, Matte
The Swift Tactical Premier 4-12x40mm Rifle Scope w/Side Focus ST7904 has been created to provide you with the ideal riflescope for all of your tactical needs. This Riflescope from Swift features a Mil-dot Reticle with Medium profile turrets that make it easy to make adjustments. The Swift Premier Tactical Rifle-Scope absorbs recoil thanks to the coil spring.
Rifle Scope Product Features
Mil-Dot Reticle
Medium profile turrets with caps
Coil spring for better recoil protection
30mm tube for better internal adjustment
Magnification – 4-12X
SWIFT ST7904M Premier Side Focus
4-12×40, Matte
Mil-dot Reticle
Medium Profile Turrets with Caps
Coil Spring for Better Recoil Protection
30mm Tube for More Internal Adjustment
About the Swift Sport Optics Manufacturer
Swift Sport Optics is a premium maker for rifle scopes, optics, mounting solutions, and other components used for guns like rifles and long guns. They style and supply their mounts, scopes, and related products making the most of elements which are long lasting and durable. This includes the Swift ST7904 Premier Tactical Riflescope, Matte by Swift Sport Optics. For additional shooting products, visit their site.
What You Need to Know About Optics
Rifle scopes enable you to exactly aim a rifle at different targets by lining up your eye with the target over a distance. They do this through magnification by employing a set of lenses inside the scope. The scope’s alignment can be adjusted to take into account many environmental factors like wind speed and elevation increases to make up for bullet drop.
The scope’s purpose is to help shooters understand precisely where the bullet will land based on the sight picture you are viewing with the optic as you align the scope’s crosshair or reticle with the intended target. The majority of modern rifle scopes and optics have about eleven parts which are found within and externally on the scope. These parts include the rifle scope’s body, lenses, windage and elevation turrets or dials, objective focus rings, and other elements. Learn about the eleven parts of optics.
Rifle Scope Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” type of optics. Choosing the optimal type of rifle optic is based around what type of shooting you plan to do.
About First Focal Plane Optics
Focal plane scopes (FFP) come with the reticle in front of the magnifying lens. This triggers the reticle to increase in size based upon the level of magnification being used. The outcome is that the reticle measurements are the same at the enhanced range as they are at the non magnified range. As an example, 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, far away kinds of shooting
- Shooting scenarios where computations are minor
- Experienced shooters who understand their target “hold over” and also “lead” equations for their long gun
- Shooters who don’t mind the reticle is bigger and occupies more visual eyesight area than a SFP reticle
Second Focal Plane Scope Facts
Second focal plane glass (SFP) include the reticle behind the zoom lens. This triggers the reticle to stay at the same overall size in relation to the level of zoom being used. The effect is that the reticle dimensions evolve based upon the zoom applied to shoot over longer ranges considering the reticle measurements present various increments which fluctuate with the zoom level. In the FFP example with the SFP optic, the 5x “zoom” 100 yard tick would be 1/5th of the non “zoom” tick reticle measurement. These styles of optics are convenient for:
- Long distance forms of shooting where shooters have more time to make ballistic estimations
- Shooting where most shots take place within shorter proximities and ranges
- Shooters who choose a clearer optic sight picture without area used up by the larger sized FFP reticle
Zoom for Scopes
The measure of scope zoom you require is based on the kind of shooting you like to do. Just about every kind of rifle scope offers some degree of zoom. The level of magnification a scope supplies is established by the dimension, thickness, and curvatures of the lenses within the rifle optic. The zoom of the scope is the “power” of the glass. This suggests what the shooter is aiming at through the scope is magnified times the power aspect of what can usually be seen by human eyes.
Fixed Power Lens Scope Info
A single power rifle optic 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 zoom of this type of scope can not fluctuate because it is a fixed power scope.
About Adjustable Power Lens Scopes
Variable power rifle scopes can be changed between magnification increments. It will note the magnification level in a format like 2-10×32. These numbers indicate the zoom of the scope could be changed in between 2x and 10x power. This always includes the power levels in-between 2 and 10. The power manipulation is accomplished by operating the power ring component of the scope near the back of the scope by the eye bell piece.
Glass Power and Range Correlation
Here are some suggested scope powers and the distances where they may be efficiently used. Highly magnified scopes will not be as useful as lower magnification glass considering too much zoom can be a negative aspect depending on your shooting distance. The same concept relates to longer distances where the shooter needs to have adequate power to see exactly where to best aim the rifle.
Details on Lens Finish
All modern-day rifle optic lenses are coated. There are different types and qualities of finishes. Lens finish can be a crucial aspect of a rifle’s setup when contemplating luxury rifle optics and targeting systems. The lenses are among the most critical pieces of the optic as they are what your eye looks through while sighting a rifle in on the point of impact. The finishing on the lenses shields the lens surface area and also assists with anti glare from refracted sunlight and color recognition.
ED Versus HD Scopes
Some scope manufacturers will also use “HD” or high-definition lens coverings that employ various processes, chemicals, polarizations, and components to extract various color ranges and viewable definition through lenses. This high-def finish is commonly used with more costly high density glass which decreases light’s chance to refract by means of the lens glass. Some scope makers use “HD” to describe “ED” signifying extra-low dispersion glass. ED deals with how colors are represented on the chromatic spectrum and the chromatic difference or aberration which is similarly called color distortion or fringing. Chromatic aberration can be noticeable around items with well defined shapes as light hits the item from particular angles.
Single Finishing Versus Multi-Coating for Scopes
Various optic lenses can even have various coverings applied to them. All lenses typically have at least some type of treatment or coating applied to them prior to being used in a rifle scope or optic. This is because the lens isn’t just a raw piece of glass. It is part of the finely tuned optic. It requires a coating to be applied to it so that it will be optimally functional in numerous kinds of environments, degrees of sunshine (full VS shaded), and other shooting conditions.
This lens treatment can protect the lens from scratches while decreasing 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 maker and how much you paid for it.
Some scope producers similarly 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 building the rifle scope.
What to Know About Anti-water Coating
Water on an optical lens doesn’t support preserving a clear sight picture through an optic at all. Lots of top of the line or premium optic producers will coat their lenses with a hydrophilic or hydrophobic finish. The Steiner Optics Nano-Protection is a fine example of this kind of treatment. It deals with the exterior surfaces of the Steiner glass lens so the water molecules can not bind to it or create surface tension. The outcome is that the water beads sheet off of the scope to preserve a clear, water free sight picture.
Choices for Mounting Scopes on Long Guns
Installing options for scopes come 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 various types of mounts also usually are made in quick release variations which use manual levers which permit rifle shooters to quickly install and remove the glass.
Optic Mounts with Hex Key Rings
Standard, 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 two separate rings to support the optic, and are often made from 7075 T6 billet aluminum which are designed for long range precision shooting. This type of scope mount is excellent for rifles which require a resilient, rock solid mounting solution which will not move no matter how much the scope is moved or abuse the rifle takes.
Rifle Glass Mounts with Quick-Release Cantilever Rings
These types of quick-release rifle scope mounts can be used to rapidly 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 connect firmly to a flat top type Picatinny rail. This permits the scope to be sighted in while on the rifle, removed from the rifle, and remounted back on the rifle while retaining accuracy. These kinds of mounts come in practical for rifles which are shipped a lot, to take off the glass from the rifle for protection, or for optics which are employed between numerous rifles. An example of this mount style is the 30mm mount designed by Vortex Optics. It usually costs around $250 USD
Sealing and Gas Purging for Optic Tubes
Wetness inside your rifle optic can mess up a day of shooting and your pricey optic by causing fogging and creating residue inside of the scope tube. The majority of scopes avoid wetness from getting in the scope tube with a system of sealing O-rings which are water resistant.
Rifle Optic Gas Purging
Another part of preventing the accumulation of wetness inside of the rifle optic tube is filling the tube with a gas like nitrogen. Considering that this space is already occupied by the gas, the scope is less affected by temperature level changes and pressure distinctions from the outdoor environment which may potentially enable water vapor to leak in around the seals to fill the vacuum which would otherwise be there. These are good qualities of a decent rifle scope to seek out.
