Description
Rifle Scope Product Details
US Optics FDN 25x 5-25x52mm FFP Horus H59 34mm Riflescope FDN-25X-H59
When it comes to pushing the limits of your rifle, the US Optics Foundation 25X 5-25x52mm Riflescope is the optic you need! Built to meet the demands of professional and competitive long range shooters, the FDN 25X is ideal for pushing shots to 2000 yards and beyond through its superb optical clarity, brightness, and adjustment mechanics. Just like all of the scopes within the Foundation series, the FND 25X is built on a 34mm maintube that is precision machined from 6061-T6 Aluminum and features a magnification throw of 180° for rapid changes in magnification. The FND 25X is outfitted with US Optics’ ER3K elevation low-profile turret and ergonomic US #1 windage knobs ensuring fast and tactile adjustments in the field.
Rifle Scope Product Features
Matte Black Type III Hard Anodized Finish
Low Profile Elevation Turret with Zero Stop
6061-T6 Aluminum 34mm Main Tube
Integrated Illumination & Parallax Knob
About the U.S. Optics Company
U.S. Optics is a premium maker for weapon scopes, optics, mounting solutions, and other add-ons used for firearms like rifles and long guns. They design and manufacture their mounts and related products choosing building materials which are long lasting and durable. This includes the US Optics FDN 25x 5-25x52mm FFP Horus H59 34mm Riflescope FDN-25X-H59 by U.S. Optics. For additional shooting products, visit their website.
Glass Information
Rifle scopes enable you to exactly aim a rifle at different targets by aligning your eye with the target over a distance. They do this through magnification by employing a series of lenses inside the scope. The scope’s alignment can be adjusted for consideration of varied environmental elements like wind speed and elevation to account for bullet drop.
The scope’s purpose is to help the shooter understand exactly where the bullet will land based upon the sight picture you are seeing via the scope as you line up the scope’s crosshair or reticle with the target. Many contemporary rifle optics have about 11 parts which are arranged internally and on the exterior of the optic. These optic pieces include the rifle scope’s body, lenses, adjustment dials, objective focus rings, and other components. Learn about the eleven parts of rifle glass.
Rifle Glass Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” style of scopes. The style of focal plane a scope has decides where the reticle or crosshair is located relative to the optic’s magnification. It simply means the reticle is situated behind or in front of the magnifying lens of the scope. Choosing the most desired kind of rifle optic is dependent on what sort of shooting you intend on doing.
First Focal Plane Optics
First focal plane glass (FFP) include the reticle in front of the magnification lens. This induces the reticle to increase in size based on the level of magnification being used. The outcome is that the reticle measurements are the same at the enhanced distance as they are at the non magnified distance. One tick on a mil-dot reticle at one hundred yards without “zoom” is still the same tick at 100 yards by using 5x “zoom”. These types of scopes work for:
- Quick acquisition, long distance types of shooting
- Shooting situations where computations are small
- Experienced shooters who have an idea for their target “hold over” and “lead” relationships for their rifles
- Shooters who do not mind the reticle is enlarged and takes up more visual eyesight room than a SFP reticle
About Second Focal Plane Glass
Second focal plane optics (SFP) include the reticle to the rear of the zoom lens. In the FFP example with the SFP scope, the 5x “zoom” 100 yard tick measurement would be 1/5th of the non “zoom” tick.
- Long distance types of shooting where shooters have extra time to make ballistic calculations
- Shooting where most shots take place within shorter proximities and ranges
- Shooters who prefer a clearer optic sight picture with less space used up by the larger size FFP reticle
About Optic Zoom
The extent of scope zoom you require is based on the style of shooting you desire to do. Virtually every type of rifle optic provides some level of magnification. The level of zoom a scope gives is determined by the dimension, thickness, and curvatures of the lenses inside of the rifle scope. The magnification level of the scope is the “power” of the opic. This suggests what the shooter is looking at through the scope is amplified times the power element of what can usually be seen by human eyes.
Single Power Lens Optic Facts
A single power rifle scope or 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 magnification of this kind of scope can not adjust given that it is a set power scope.
Adjustable Power Lens Glass Facts
Variable power rifle scopes can be tweaked between magnified levels. The power modification is performed by the power ring part of the scope near the back of the scope by the eye bell.
Power and Range Correlations
Here are some suggested scope power levels and the distances where they may be effectively used. Always remember that high magnification glass will not be as efficient as lower powered optics and scopes because excessive magnification can be a detractor. The very same idea goes for extended distances where the shooter needs sufficient power to see precisely where to properly aim the rifle at the target.
About Scope Lens Coating
All current rifle optic lenses are coated. Lens coating is a significant element of a shooting system when purchasing high end rifle optics and scope setups.
HD Versus ED Rifle Optic Lens Coatings
Some scope companies also use “HD” or high-def glass coatings that make the most of different processes, components, rare earth compounds, and polarizations to extract separate color ranges and viewable definition through the lens. This HD finishing is normally used with greater density glass which reduces light’s opportunity to refract by means of the lens glass. Some scope brands use “HD” to refer to “ED” suggesting extra-low dispersion glass. ED deals with how certain colors are presented on the chromatic spectrum and the chromatic aberration or difference which is also called color distortion or fringing. Chromatic aberration is often visible around things with hard edges and outlines as light hits the item from specific angles.
Single Glass Lens Finish Versus Multi-Coating
Different optic lenses can likewise have different finishes used to them. All lenses typically have at least some type of treatment or coating used to them before being used in a rifle scope or optic.
This lens treatment can offer protection to the lens from scratches while reducing glare and other less useful 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 similarly make it a point to define if their optic lenses are covered or “multi” coated. Being “better” depends on the producer’s lens treatment innovation and the quality of materials used in developing the rifle scope.
Hydrophobic Rifle Optic Lens Finishing
Water on a lens doesn’t assist with preserving a clear sight picture through a scope at all. Lots of top of the line and military grade scope companies will coat their lenses with a hydrophilic or hydrophobic anti-water finishing.
Optic Installation Choices
Mounting solutions for scopes come in a couple of choices. There are the standard scope rings which are separately mounted to the optic and one-piece scope mounts which cradle the scope. These various types of mounts also generally can be found in quick release versions which use toss levers which allow rifle operators to rapidly install and remove the scope.
Hex Key Rifle Scope Ring Mounting Solutions
Standard, clamp-on design mounting optic rings use hex head screws to install to the flattop style Picatinny scope mount rails on rifles. These forms of scope mounts use double independent rings to support the optic, and are normally constructed from 7075 T6 billet aluminum which are made for long distance precision shooting. This kind of scope mount is exceptional for rifle systems which are in need of a resilient, rock solid mount which will not change regardless of just how much the scope is moved or abuse the rifle takes. These are the style of mounts you should have for a devoted optics system on a long distance scouting or competition rifle which will almost never need to be changed or recalibrated. Blue 242 Loctite threadlocker can additionally be used on screws to protect against the hex screws from backing out after they are mounted firmly in position. An example of these rings are the 30mm style made by the Vortex Optics brand. The set normally costs around $200 USD
Quick-Release Cantilever Rifle Scope Ring Mounts
These types of quick-release rifle scope mounts can be used to quickly take off a scope and connect it to a different rifle. Several scopes can also be swapped out if they all use a similar design mount. These types of mounts are handy for rifle platforms which are transported a lot, to remove the optic from the rifle for protecting the scope, or for optics which are used between several rifles.
Rifle Optic Tube Sealing and Gas Purging
Wetness inside your rifle scope can ruin a day of shooting and your costly optic by triggering fogging and producing residue inside of the scope tube. A lot of scopes avoid wetness from entering the scope tube with a system of sealing O-rings which are water resistant.
Info Around Optic Tube Gas Purging
Another element of avoiding the buildup of wetness within the rifle optic tube is filling the tube with a gas like nitrogen. Considering that this area is already taken up by the gas, the scope is less affected by temperature shifts and pressure distinctions from the outside environment which might possibly allow water vapor to leak in around the seals to fill the void which would otherwise exist. These are good qualities of a decent rifle scope to seek out.
