Description
Rifle Scope Product Details
U.S. Optics FDN-17X Riflescope, 3.2-17x50mm, 34mm Tube, FFP, Gap Reticle, 1/10 MIL FDN 17X Gap
U.S. Optics FDN-17X Riflescope, 3.2-17x50mm, 34mm Tube, FFP, GAP Reticle, 1/10 MIL Elevation/ Windage Adjustment, Black, Medium, FDN 17X GAP
Rifle Scope Product Features
U.S. Optics FDN-17X Riflescope
3.2-17x50mm, 34mm Tube
FFP, Gap Reticle, 1/10 MIL FDN 17X Gap
About the U.S. Optics Scope Maker
U.S. Optics is a premium manufacturer for long gun scopes, optics, mounting solutions, and other add-ons used for guns like rifles and long guns. They create and supply their products making the most of elements which are long lasting and durable. This includes the U.S. Optics FDN-17X Riflescope, 3.2-17x50mm, 34mm Tube, FFP, Gap Reticle, 1/10 MIL FDN 17X Gap by U.S. Optics. For additional shooting items, visit their site.
Information Optics
Rifle scopes enable you to specifically align a rifle at various targets by lining up your eye with the target over a distance. They do this through zoom by employing a series of lenses within the scope. The scope’s alignment can be dialed in to account for many environmental aspects like wind and elevation to make up for bullet drop.
The scope’s purpose is to understand exactly where the bullet will land based upon the sight picture you are viewing through the scope as you line up the scope’s crosshair or reticle with the target. A lot of contemporary rifle optics have about eleven parts which are arranged inside and externally on the optic. These scope parts include the rifle scope’s body, lenses, windage and elevation dials, focus rings, and other elements. Learn about the eleven parts of rifle scopes.
The Varieties of Rifle Scopes
Rifle scopes can be either “first focal plane” or “second focal plane” style of scopes. The form of focal plane an optic has establishes where the reticle or crosshair lies in regard to the scopes zoom. It simply suggests the reticle is behind or ahead of the magnification lens of the scope. Picking the most ideal form of rifle optic is based upon what form of shooting or hunting you intend on undertaking.
Info About First Focal Plane Scopes
Focal plane scopes (FFP) feature the reticle in front of the magnification lens. This triggers the reticle to increase in size based upon the level of zoom being used. The benefit is that the reticle measurements are the same at the enhanced distance as they are at the non amplified distance. For example, one tick on a mil-dot reticle at one hundred yards without having “zoom” is still the same tick at one hundred yards with 5x “zoom”. These types of scopes are valuable for:
- Quick acquisition, far away kinds of shooting
- Shooting circumstances where calculations are marginal
- Experienced shooters who recognize their aim point “hold over” plus “lead” ratios for their weapon
- Shooters who don’t mind the reticle is bigger and occupies more visual eyesight room than a SFP reticle
Second Focal Plane Glass
Second focal plane optics (SFP) come with the reticle to the rear of the zoom lens. This causes the reticle to stay at the same overall size in relation to the volume of magnification being used. The outcome is that the reticle measurements adapt based on the zoom applied to shoot over longer distances given that the reticle measurements present different increments which change with the magnification level. In the FFP example with the SFP glass, the 5x “zoom” one hundred yard tick would be 1/5th of the non “zoom” tick. These particular types of glass work for:
- Far away forms of shooting where shooters have extra time to make ballistic estimations
- Shooting where most of the shots occur within much shorter proximities and ranges
- Shooters who choose a clearer optic sight picture without area used up by the enlarged FFP reticle
Rifle Glass Magnification
The amount of zoom a scope supplies is figured out by the diameter, density, and curvatures of the lenses inside of the rifle scope. The magnification of the scope is the “power” of the scope.
Fixed Power Lens Rifle Glass
A single power rifle optic and scope comes with a zoom 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 scope can not fluctuate given that it is a set power scope.
Info on Adjustable Power Lens Rifle Scopes
Variable power rifle scopes can be changed between magnification increments. These types of scopes will note the magnification degree in a format like 2-10×32. These numbers suggest the magnification of the scope can be adjusted between 2x and 10x power. This additionally utilizes the power levels in-between 2 and 10. The power modification is achieved by employing the power ring part of the scope near the back of the scope by the eye bell.
The Power Level and Range of Optics
Here are some recommended scope power settings and the ranges where they may be successfully used. Highly magnified glass will not be as effective as lower magnification optics because too much zoom can be a negative aspect depending on your shooting distance. The same concept applies to extended distances where the shooter needs enough power to see exactly where to properly aim the rifle.
Details on Optic Lens Finish
All modern-day rifle optic and scope lenses are covered in special coatings. There are various types and qualities of finishes. When looking at luxury rifle targeting devices, Lens covering can be a vital component of defining the capability of the rifle. The lenses are one of the most crucial pieces of the optic because they are what your eye looks through while sighting a rifle in on the point of impact. The coating on the lenses protects the lens surface area and even improves anti glare capabilities from refracted sunlight and color presence.
HD Versus ED Lens Coatings
Some optic makers also use “HD” or high-def lense finishings that apply various procedures, elements, polarizations, and chemical applications to extract different color ranges and viewable target definition through the lens. This HD finishing is typically used with more costly high density glass which brings down light’s potential to refract by means of the lens glass. Some scope vendors use “HD” to refer to “ED” implying extra-low dispersion glass. ED deals with how certain colors are presented on the chroma spectrum and the chromatic difference or aberration which is similarly called color distortion or fringing. Chromatic aberration is often visible over objects with defined outlines as light hits the item from various angles.
Info on Single Covering Versus Multi-Coating
Various optic lenses can also have various coatings applied to them. All lenses normally have at least some type of treatment or covering used to them before being used in a rifle scope or optic.
This lens treatment can safeguard the lens from scratches while minimizing glare and other less helpful things experienced in the shooting environment while sighting in with the scope. The quality of a single covered lens depends on the scope maker and how much you paid for it.
Some scope manufacturers also make it a point to specify if their optic lenses are covered or “multi” covered. Being “better” depends on the producer’s lens treatment innovation and the quality of products used in building the rifle scope.
Anti-water Lens Coating
Water on a lens doesn’t assist with preserving a clear sight picture through a scope at all. Many top of the line and high-end scope makers will coat their lenses with a hydrophilic or hydrophobic finish which is water repellent.
Choices for Mounting Glass on Long Guns
Installing options for scopes are available in a couple of choices. There are the standard scope rings which are individually mounted to the scope and one-piece mounts which cradle the scope. These different types of mounts also usually come in quick release versions which use manual levers which enable rifle operators to quickly install and dismount the scope.
Hex Key Rifle Scope Rings
Normal, clamp style mounting scope rings use hex head screws to mount to the flattop style Picatinny scope installation 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 created for long distance accuracy shooting. This type of scope install is wonderful for rifles which need a long lasting, rock solid mounting solution which will not move no matter how much the scope is moved or abuse the rifle takes.
Quick-Release Cantilever Rifle Glass Ring Mounting Solutions
These types of quick-release rifle scope mounts can be used to rapidly take off a scope from a rifle and reattach it to a different rifle. If they all use a comparable style mount, a number of scopes can also be switched on the range. The quick detach design is CNC crafted from anodized 6061 T6 aluminum and the mounting levers connect nicely to a flat top style Picatinny rail. This enables the scope to be sighted in while on the rifle, taken off of the rifle, and remounted while preserving precision. These types of mounts come in beneficial for shooting platforms which are moved around a lot, to take off the scope from the rifle for protection, or for scopes which are employed in between a number of rifles. An example of this mount style is the 30mm mount designed by Vortex Optics. It generally costs around $250 USD
What to Know About Rifle Glass Tube Sealing and Gas Purging
Moisture inside your rifle glass can destroy a day of shooting and your highly-priced optic by causing fogging and generating residue inside of the scope’s tube. A lot of optics protect against moisture from entering the scope tube with a series of sealing O-rings which are waterproof. Typically, these water-resistant scopes can be submerged underneath 20 or 30 feet of water before the water pressure can push moisture past the O-rings. This should be sufficient moisture content avoidance for basic use rifles, unless you intend on taking your rifle on boats and are concerned about the optic still functioning if it is submerged in water and you can still retrieve the gun.
Rifle Scope Gas Purging
Another part of preventing the accumulation of wetness inside of the rifle optic’s tube is filling the tube with a gas like nitrogen. Since this space is currently taken up by the gas, the optic is less impacted by temp shifts and pressure variations from the outdoor environment which may potentially allow water vapor to leak in around the seals to fill the void which would otherwise be there. These are good qualities of a good rifle scope to look for.
