Description
Rifle Scope Product Details
U.S. Optics FDN-17X Riflescope, 3.2-17x50mm, 34mm Tube, FFP, GEN II XR Reticle, FDN 17X GENIIXR, Black
U.S. Optics FDN-17X Riflescope, 3.2-17x50mm, 34mm Tube, FFP, GEN II XR Reticle, 1/10 MIL Elevation/ Windage Adjustment, Black, Medium, FDN 17X GENIIXR
Rifle Scope Product Features
U.S. Optics FDN-17X Riflescope
3.2-17x50mm, 34mm Tube
FFP, GEN II XR Reticle, FDN 17X GENIIXR
Package Weight: 4.0 pounds
About the U.S. Optics Scope Maker
U.S. Optics is a premium maker for firearm scopes, optics, mounts, and other accessories used for firearms like rifles and long guns. They style and manufacture their scopes and related products choosing elements which are resilient and long lasting. This includes the U.S. Optics FDN-17X Riflescope, 3.2-17x50mm, 34mm Tube, FFP, GEN II XR Reticle, FDN 17X GENIIXR, Black by U.S. Optics. For more shooting products, visit their website.
What You Need to Know About Glass
Rifle scopes enable you to precisely align a rifle at different targets by aligning your eye with the target over a distance. They do this through zoom by making use of a series of lenses inside the scope. The scope’s positioning can be adjusted for the consideration of many environmental things like wind and elevation increases to make up for bullet drop.
The scope’s purpose is to understand exactly where the bullet will land based on the sight picture you are seeing using the scope as you line up the scope’s crosshair or reticle with the target. Most contemporary rifle optics have about eleven parts which are located inside and outside of the scope body. These parts include the rifle scope’s body, lenses, windage turrets, focus rings, and other components. Learn about the eleven parts of rifle scopes.
Rifle Glass Styles
Rifle scopes can be either “first focal plane” or “second focal plane” type of optics. Deciding on the finest type of rifle scope depends on what type of shooting you plan to do.
First Focal Plane Glass Facts
Focal plane scopes (FFP) feature the reticle in front of the magnification lens. These styles of scopes are beneficial for:
- Quick acquisition, far away types of shooting
- Shooting scenarios where computations are minimal
- Experienced shooters who recognize their target “hold over” and also “lead” correlations for their long guns
- Shooters who do not mind the reticle is enlarged and uses up more visual eyesight area than a SFP reticle
Info About Second Focal Plane Scopes
Second focal plane glass (SFP) come with the reticle behind the magnification lens. This causes the reticle to remain at the same size in relation to the quantity of magnification being used. The result is that the reticle measurements evolve based on the magnification chosen to shoot over greater ranges since the reticle markings present distinct increments which differ with the zoom. In the FFP example with the SFP scope, the 5x “zoom” 100 yard tick would be 1/5th of the non “zoom” tick measurement. These particular varieties of scopes are useful for:
- Long distance styles of shooting where shooters have more time to make ballistic calculations
- Shooting where most of the shots take place within much shorter ranges and spaces
- Shooters who select a clearer optic picture with less area used up by the larger sized FFP reticle
Magnification for Optics
The quantity of magnification a scope supplies is figured out by the size, density, and curvatures of the lenses inside of the rifle scope. The zoom of the scope is the “power” of the scope.
Info on Fixed Single Power Lens Glass
A single power rifle optic will have a magnification number designator like 4×32. This suggests the zoom power of the scope is 4x power while the objective lens is 32mm. The zoom of this kind of optic can not fluctuate since it is fixed.
Info on Adjustable Power Lens Rifle Optics
Variable power rifle scopes use enhanced power. The power change is achieved by using the power ring part of the scope near the back of the scope by the eye bell.
The Power Level and Range of Rifle Glass
Here are some advised scope power levels and the ranges where they can be successfully used. High power rifle scope glass will not be as effective as lower powered optics due to the fact that too much zoom can be a negative aspect depending on your shooting distance. The exact same idea applies to extended distances where the shooter needs to have adequate power to see where to best aim the rifle.
Optic Lens Covering
All modern rifle optic lenses are covered in special coatings. There are different types and qualities of glass lens finishings. When looking at luxury rifle optics and scope setups, Lens finishing can be an important element of defining the rifle’s capability. The glass lenses are among the most critical pieces of the glass since they are what your eye looks through while sighting a rifle in on the point of impact. The covering on the lenses protects the lens surface area and even improves anti glare capabilities from refracted sunrays and color visibility.
Info on Lens Coatings – HD Versus ED
Some scope producers also use “HD” or high-definition lens coverings which use various procedures, polarizations, aspects, and chemicals to draw out different colors and viewable quality through the lens. Some scope producers use “HD” to refer to “ED” meaning extra-low dispersion glass.
Single Finishing Versus Multi-Coating for Rifle Glass
Various optic lenses can also have different finishes applied to them. All lenses typically have at least some type of treatment or coating used to them before they are used in a rifle scope or optic.
This lens treatment can safeguard the lens from scratches while reducing glare and other less advantageous things experienced in the shooting environment while sighting in with the scope. The quality of a single covered lens depends on the scope producer and how much you paid for it.
Some scope producers also make it a point to define if their optic lenses are covered or “multi” coated. This indicates the lens has had multiple treatments applied to the surfaces of the glass. If a lens gets numerous treatments, it can prove that a manufacturer is taking several steps to combat different environmental aspects like an anti-glare finish, a scratch resistant anti-abrasion finish, followed by a hydrophilic finishing. This additionally does not necessarily indicate the multi-coated lens will perform much better than a single layered lens. Being “much better” depends on the manufacturer’s lens treatment solutions and the quality of components used in developing the rifle glass.
Glass Lens Hydrophobic Covering
Water on a lens does not help with maintaining a clear sight picture through a scope at all. Numerous top of the line and high-end optic makers will coat their lenses with a hydrophobic or hydrophilic finish.
Options for Mounting Glass on Firearms
Mounting solutions for scopes come in a couple of choices. There are the basic scope rings which are individually installed to the scope and one-piece mounts which cradle the scope. These different types of mounts also usually are made in quick release variations which use throw levers which permit rifle shooters to rapidly mount and remove the scopes.
Scope Mounting Solutions 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 a couple of separate rings to support the optic, and are made from 7075 T6 billet aluminum which is created for long distance precision shooting. This type of scope install is excellent for rifles which require a durable, rock solid mount which will not move no matter how much the scope is moved or abused.
Quick-Release Cantilever Rifle Glass Rings
These kinds 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. Several scopes can also be swapped out if they all use a similar style mount. The quick detach mount style is CNC crafted from anodized 6061 T6 aluminum and the mounting levers connect nicely to a flat top design Picatinny rail. This permits 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 types of mounts come in practical for rifles which are shipped a lot, to take off the optic from the rifle for protection, or for scopes which are utilized in between multiple rifles. An example of this mount style is the 30mm mount designed by Vortex Optics. It generally costs around $250 USD
Sealing and Gas Purging for Rifle Optic Tubes
Moisture inside your rifle optic can mess up a day of shooting and your pricey optic by bringing about fogging and creating residue inside of the scope tube. Many scopes avoid moisture from entering the scope tube with a system of sealing O-rings which are waterproof.
Details on Rifle Optic Tube Gas Purging
Another component of avoiding the accumulation of moisture inside of the rifle optic tube is filling the tube with a gas like nitrogen. Considering that this space is currently occupied by the gas, the glass is less impacted by temperature level shifts and pressure differences from the outdoor environment which might potentially allow water vapor to seep in around the seals to fill the vacuum which would otherwise be there. These are good qualities of a good rifle scope to seek out.
