Description
Rifle Scope Product Details
U.S. Optics FDN-25X Riflescope, 5-25x52mm, 34mm Tube, FFP, Horus H102 Reticle, 1/10 FDN 25X H102
U.S. Optics FDN-25X Riflescope, 5-25x52mm, 34mm Tube, FFP, HORUS H102 Reticle, 1/10 MIL Elevation/ Windage Adjustment, Black, Medium, FDN 25X H102
Rifle Scope Product Features
About the U.S. Optics Brand
U.S. Optics is a premium producer for rifle scopes, optics, mounting solutions, and other components used for firearms like rifles and long guns. They create and make their mounts, scopes, and related products by applying elements which are resilient and long lasting. This includes the U.S. Optics FDN-25X Riflescope, 5-25x52mm, 34mm Tube, FFP, Horus H102 Reticle, 1/10 FDN 25X H102 by U.S. Optics. For additional shooting items, visit their site.
What You Need to Know About Glass
Rifle scopes allow you to specifically aim a rifle at various targets by lining up your eye with the target over a range. They accomplish this through zoom using a set of lenses inside the scope. The scope’s positioning can be adjusted to take into account varied natural aspects like wind speed and elevation increases or decreases to make up for bullet drop.
The scope’s function is to help the shooter understand exactly where the bullet will hit based upon the sight picture you are seeing with the scope as you align the scope’s crosshair or reticle with the intended target. The majority of contemporary rifle scopes and optics have around 11 parts which are found inside and externally on the scope body. These parts consist of the rifle scope’s body, lenses, adjustment turrets, objective focus rings, and other elements. See all eleven parts of a scope.
The Styles 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 decides where the reticle or crosshair is located in relation to the optic’s zoom. It literally means the reticle is situated behind or in front of the magnifying lens of the scope. Picking the most ideal kind of rifle optic is based upon what kind of shooting you plan on undertaking.
First Focal Plane Scope Details
Focal plane scopes (FFP) feature the reticle in front of the zoom lens. This causes the reticle to increase in size based on the level of magnification being used. The result is that the reticle measurements are the same at the enhanced distance as they are at the non magnified distance. For instance, one tick on a mil-dot reticle at 100 yards without “zoom” is still the corresponding tick at one hundred yards with 5x “zoom”. These kinds of scopes are practical for:
- Quick acquisition, long distance types of shooting
- Shooting circumstances where computations are marginal
- Experienced shooters who have an idea for their aim point “hold over” plus “lead” relationships for their long gun
- Shooters who do not mind the reticle is bigger and uses up more visual eyesight area than a SFP reticle
Second Focal Plane Glass
Second focal plane scopes (SFP) include the reticle behind the zoom lens. In the FFP example with the SFP scope, the 5x “zoom” one hundred yard tick reticle measurement would be 1/5th of the non “zoom” tick.
- Long distance kinds of shooting where shooters have additional time to make ballistic calculations
- Shooting where most shots take place within much shorter spaces and ranges
- Shooters who like a clearer optic sight picture without room taken up by the larger size FFP reticle
Zoom for Rifle Scopes
The quantity of zoom a scope provides 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 Optic Details
A single power rifle optic will have a zoom number designator like 4×32. This suggests 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 fixed.
About Variable Power Lens Rifle Optics
Variable power rifle scopes can be modified between magnified levels. The power modification is performed by using the power ring part of the scope near the rear of the scope by the eye bell.
Optic Power and Range Correlation
Here are some recommended scope powers and the distances where they may be efficiently used. High power scopes will not be as beneficial as lower magnification optics given that too much zoom can be a negative aspect depending on your shooting distance. The same concept goes for extended distances where the shooter needs increased power to see precisely where to best aim the rifle.
Details on Rifle Scope Lens Finishes
All modern rifle optic and scope lenses are covered. Lens finish can be a crucial element of a shooting platform when thinking about high end rifle optics and scope systems.
HD Versus ED Rifle Glass Lens Coatings
Some optic companies additionally use “HD” or high-definition lense coverings that take advantage of different procedures, rare earth compounds, elements, and polarizations to draw out various color ranges and viewable definition through lenses. This high-definition coating is typically used with more costly high density glass which lowers light’s capability to refract by means of the lens glass. Some scope suppliers use “HD” to refer to “ED” implying extra-low dispersion glass. ED handles how certain colors are represented on the chromatic spectrum and the chromatic aberration or deviance which is also called color distortion or fringing. Chromatic aberration can be obvious over objects with well defined outlines as light hits the object from specific angles.
Single Covering Versus Multi-Coating
Various optic lenses can likewise have different coverings used to them. All lenses normally have at least some type of treatment or finish used to them before being used in a rifle scope or optic.
Single coated 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 minimizing glare and other less beneficial things experienced in the shooting environment while sighting in with the optic. The quality of a single layered lens depends on the scope manufacturer and just how much you spent on it. The scope’s maker and cost are indicators of the lens quality.
Some scope manufacturers likewise make it a point to specify if their optic lenses are coated or “multi” covered. This implies the lens has several treatments applied to the surfaces. If a lens receives several treatments, it can establish that a manufacturer is taking several steps to fight various environmental factors like an anti-glare finishing, a scratch resistant anti-abrasion finishing, followed by a hydrophilic finish. This additionally doesn’t necessarily indicate the multi-coated lens will perform much better than a single layered lens. Being “much better” depends on the maker’s lens treatment solutions and the quality of products used in building the rifle optic.
Rifle Glass Lens Anti-water Finish
Water on a lens does not help with maintaining a clear sight picture through a scope at all. Lots of top of the line and high-end optic makers will coat their lenses with a hydrophilic or hydrophobic coating which is water repellent.
Choices for Mounting Rifle Scopes on Long Guns
Installing options for scopes can be found in a couple of options. There are the standard scope rings which are separately installed to the optic and one-piece scope mounts which cradle the scope. These various types of mounts also generally are made in quick release variations which use manual levers which enable rifle operators to quickly install and dismount the optics.
Hex Key Rifle Scope Rings
Standard, clamp-on style mounting scope rings use hex head screws to install to the flattop design Picatinny scope mounting rails on rifles. These types of scope mounts use a pair of individual rings to support the optic, and are usually constructed from 7075 T6 billet aluminum or similar materials which are developed for long distance precision shooting. This type of scope mount is very good for rifles which are in need of a long lasting, hard use mount which will not shift despite how much the scope is moved about or abuse the rifle takes. These are the design of mounts you should get for a dedicated scope setup on a reach out and touch someone hunting or competition firearm which will almost never need to be altered or recalibrated. Blue 242 Loctite threadlocker can additionally be used on the screws to stop the hex screw threads from backing out after they are installed firmly in place. An example of these mounting rings are the 30mm type made by the Vortex Optics company. The set typically costs around $200 USD
Quick-Release Cantilever Optic Rings
These types of quick-release rifle scope mounts can be used to rapidly detach a scope from a rifle and reattach it to a different rifle. Multiple scopes can also be swapped out if they all use a complementary style mount. The quick detach design is CNC machined from anodized 6061 T6 aluminum and the mounting levers fasten nicely to a flat top style Picatinny rail. This allows the scope to be sighted in while on the rifle, removed from the rifle, and remounted back on the rifle while preserving the original sighting settings. These kinds of mounts are useful and practical for shooting platforms which are transferred between vehicles a lot, to take off the scope from the rifle for protection, or for aiming systems which are employed between several rifles. An example of this mount style is the 30mm mount designed by Vortex Optics. It normally costs around $250 USD
Sealing and Gas Purging for Optic Tubes
Moisture inside your rifle optic can spoil a day on the range and your costly optic by resulting in fogging and making residue within the scope tube. Many optics protect against moisture from entering the scope tube with a system of sealing O-rings which are water resistant. Generally, these optics can be immersed under 20 or 30 feet of water before the water pressure can push moisture past the O-rings. This should be more than enough moisture prevention for standard use rifles, unless you intend on taking your rifle aboard a watercraft and are concerned about the scope still working if it falls overboard and you can still salvage the gun.
Rifle Glass Gas Purging
Another part of avoiding the buildup of wetness 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 optic is less affected by temperature alterations and pressure differences from the outside environment which might possibly enable water vapor to permeate in around the seals to fill the vacuum which would otherwise be there. These are good qualities of a good rifle scope to look for.
