Description
Rifle Scope Product Details
U.S. Optics FDN-25X Riflescope, 5-25x52mm, 34mm Tube, FFP, JVCR Reticle, 1/10 MIL FDN 25X JVCR
U.S. Optics FDN-25X Riflescope, 5-25x52mm, 34mm Tube, FFP, JVCR Reticle, 1/10 MIL Elevation/ Windage Adjustment, Black, FDN 25X JVCR
Rifle Scope Product Features
About the U.S. Optics Company
U.S. Optics is a premium manufacturer for long gun scopes, optics, mounts, and other accessories used for firearms like rifles and long guns. They create and build their mounts and related products making the most of materials which are long lasting and resilient. This includes the U.S. Optics FDN-25X Riflescope, 5-25x52mm, 34mm Tube, FFP, JVCR Reticle, 1/10 MIL FDN 25X JVCR by U.S. Optics. For more shooting goods, visit their website.
Rifle Glass Facts
Rifle scopes enable you to precisely aim a rifle at various targets by lining up your eye with the target over a range. They accomplish this through zoom by making use of a series of lenses inside the scope. The scope’s positioning can be dialed in to account for different ecological considerations like wind and elevation increases or decreases to account for bullet drop.
The scope’s purpose is to help shooters understand exactly where the bullet will hit based upon the sight picture you are seeing using the optic as you line up the scope’s crosshair or reticle with the intended point of impact. Many modern-day rifle optics have around eleven parts which are found inside and outside of the optic. These scope parts include the rifle scope’s body, lenses, windage turrets or dials, focus rings, and other parts. Learn about the eleven parts of scopes.
About Rifle Glass Types
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. The kind of focal plane a scope has establishes where the reticle or crosshair is located in regard to the optic’s magnifying adjustments. It literally indicates the reticle is located behind or before the magnifying lens of the optic. Deciding upon the most reliable style of rifle optic depends upon what type of shooting you plan on doing.
About First Focal Plane Glass
Focal plane scopes (FFP) feature the reticle in front of the magnification lens. This causes the reticle to increase in size based on the level of zoom being used. The result is that the reticle measurements are the same at the amplified range as they are at the non amplified range. For instance, one tick on a mil-dot reticle at one hundred yards without having “zoom” is still the same tick at 100 yards with 5x “zoom”. These types of scopes work for:
- Quick acquisition, far away types of shooting
- Shooting situations where calculations are very little
- Experienced shooters who know their aim point “hold over” and also “lead” correlations for their firearms
- Shooters who don’t mind the reticle is enlarged and uses up more visual eyesight room than a SFP reticle
Second Focal Plane Glass Details
Second focal plane optics (SFP) feature the reticle behind the magnifying lens. This triggers the reticle to remain at the same overall size in relation to the volume of zoom being used. The end result is that the reticle measurements evolve based upon the magnification used to shoot over greater ranges since the markings represent various increments which vary with the magnification level. In the FFP illustration with the SFP glass, the 5x “zoom” one hundred yard tick would be 1/5th of the non “zoom” tick reticle measurement. These varieties of glass are handy for:
- Far away types of shooting where shooters have more time to make ballistic computations
- Shooting where most of the shots take place within shorter ranges and distances
- Shooters who prefer a clearer optic picture with less space taken up by the enlarged FFP reticle
About Scope Zoom
The level of scope zoom you require depends upon the sort of shooting you intend to do. Practically every type of rifle scope delivers some amount of zoom. The amount of magnification a scope delivers is established by the size, thickness, and curvatures of the lens glass within the rifle optic. The magnification level of the optic is the “power” of the glass. This indicates what the shooter is looking at through the scope is magnified times the power aspect of what can typically be seen by human eyes.
Single Power Lens Optics
A single power rifle optic uses a zoom number designator like 4×32. This indicates the zoom power of the scope is 4x power while the objective lens is 32mm. The zoom of this kind of scope can not adjust because it is a fixed power scope.
Adjustable Power Lens Glass
Variable power rifle scopes use variable power levels. The power change is performed by the power ring part of the scope near the back of the scope by the eye bell.
Rifle Glass Power Level and Range Correlation
Here are some advised scope powers and the ranges where they could be efficiently used. Remember that high power scopes will not be as practical as lower magnification level optics because excessive zoom can be a negative thing in certain situations. The same relates to longer ranges where the shooter needs to have increased power to see exactly where to properly aim the rifle at the target.
Rifle Optic Lens Coating
All top of the line rifle optic lenses are covered. Lens finish can be an essential aspect of a rifle when looking at high end rifle optics and scope setups.
ED Versus HD Optics
Some optic manufacturers even use “HD” or high-def lense finishings that take advantage of different procedures, rare earth compounds, polarizations, and elements to extract numerous color ranges and viewable target visibility through lenses. This high-definition finishing is frequently used with increased density lens glass which reduces light’s opportunity to refract by means of the lens glass. Some scope vendors use “HD” to describe “ED” implying extra-low dispersion glass. ED deals with how colors are represented on the chroma spectrum and the chromatic deviance or aberration which is similarly called color distortion or fringing. Chromatic aberration can be visible around objects with defined outlines as light hits the object from certain angles.
Single Coating Versus Multi-Coating
Various optic lenses can also have different finishings applied to them. All lenses usually have at least some type of treatment or finishing applied to them before they are used in a rifle scope or optic.
Single covered lenses have a treatment applied to them which is usually a protective and improving multi-purpose treatment. This lens treatment can preserve the lens from scratches while decreasing glare and other less advantageous things experienced in the shooting environment while sighting in with the optic. The quality of a single covered lens depends upon the scope producer and the amount you paid for it. Both are indications of the lens quality.
Some scope producers also make it a point to define if their optic lenses are coated or “multi” covered. Being “much better” depends on the maker’s lens treatment innovation and the quality of materials used in developing the rifle scope.
Hydrophobic Finish for Glass
Water on a lens does not help with keeping a clear sight picture through a scope at all. Lots of top of the line and high-end optic companies will coat their lenses with a hydrophilic or hydrophobic finishing.
Glass Mounting Choices
Mounting options for scopes are available in a few choices. There are the basic scope rings which are separately mounted to the optic and one-piece mounts which cradle the scope. These different kinds of mounts also normally can be found in quick release variations which use toss levers which enable rifle operators to quickly mount and dismount the optics.
Rifle Optic Mounting Solutions with Hex Key Rings
Standard, clamp design mounting scope rings use hex head screws to mount to the flattop design Picatinny scope installation rails on rifles. These types of scope mounts use a couple of separate rings to support the optic, and are often made from 7075 T6 billet aluminum which is developed for long distance precision shooting. This type of scope mount is great for rifles which need a durable, rock solid mount which will not move no matter how much the scope is moved or abused.
Rifle Glass Mounts with Quick-Release Cantilever Rings
These types of quick-release rifle scope mounts can be used to quickly attach and detach a scope from a rifle. Multiple scopes can also be swapped out if they all use a complementary designed mount. The quick detach mount style is CNC machined from anodized 6061 T6 aluminum and the mounting levers fasten securely to a flat top type Picatinny rail. This enables the scope to be sighted in while on the rifle, taken off of the rifle, and remounted back on the rifle while keeping accuracy. These kinds of mounts are useful and beneficial for rifles which are carried a lot, to remove the optic from the rifle for protection, or for optics which are chosen for use in between multiple rifles. An example of this mount type is the 30mm mount designed by Vortex Optics. It usually costs around $250 USD
Glass Tube Sealing and Gas Purging
Wetness inside your rifle optic can ruin a day of shooting and your costly optic by bringing about fogging and producing residue inside of the scope tube. Most scopes prevent moisture from getting in the scope tube with a system of sealing O-rings which are waterproof.
Info Around Rifle Scope Tube Gas Purging
Another part of preventing the accumulation of moisture within the rifle scope tube is filling the tube with a gas like nitrogen. Considering that this space is currently occupied by the gas, the scope is less altered by temp shifts and pressure differences from the external environment which might possibly permit water vapor to permeate in around the seals to fill the vacuum which would otherwise exist. These are good qualities of a decent rifle scope to seek out.
