Description
Rifle Scope Product Details
US Optics FDN 10X H425
The U.S. Optics FDN-10X Riflescope, 1.8-10x40mm, 34mm Tube, FFP, HORUS H425 Reticle, 1/10 MIL Elevation/ Windage Adjustment, Black, Small, FDN 10X H425 Objective Lens Diameter: 40, Magnification: 1.8 – 10, Reticle: Horus Vision H425, Tube Diameter: 34, Reticle Focal Plane: First Focal Plane (FFP), Exit Pupil: 3.2, Battery Type: CR2032, Field of View, Linear: 36 – 11.3, Color: Matte Black, Weight: 25.7, Fabric/Material: Aluminum, Length: 12.98, Width: 3.883, Height: 2.43, Illumination Type: LED, Illumination Color: Red, Adjustment Type: Mil Rad, Adjustment Click Value: 1/10, Parallax: 30, Finish: Type III Hard Coat Anodized, Magnification Type: Variable, W/E Travel at 100 Yds: 28.
Rifle Scope Product Features
U.S. Optics FDN-10X Riflescope
1.8-10x40mm, 34mm Tube
FFP, HORUS H425 Reticle
1/10 MIL Elevation/ Windage Adjustment
About the U.S. Optics Company
U.S. Optics is a premium producer for rifle scopes, optics, mounting solutions, and other add-ons used for guns like rifles and long guns. They style and supply their mounts and related products working with building materials which are durable and long lasting. This includes the US Optics FDN 10X H425 by U.S. Optics. For more shooting items, visit their site.
What You Need to Know About Rifle Optics
Rifle scopes enable you to exactly aim a rifle at various targets by lining up your eye with the target over a distance. They do this through magnifying the target by using a set of lenses within the scope. The scope’s positioning can be adjusted to account for many environmental things like wind speed and elevation to make up for bullet drop.
The scope’s function is to help shooters understand precisely where the bullet will hit based upon the sight picture you are seeing through the scope as you line up the scope’s crosshair or reticle with the intended point of impact. Many contemporary rifle optics have around eleven parts which are found within and outside of the scope body. These optic pieces consist of the rifle scope’s body, lenses, adjustment turrets, focus rings, and other elements. See all eleven parts of a rifle optical system.
Rifle Glass Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. Deciding upon the perfect type of rifle optic is based around what type of shooting you plan on doing.
First Focal Plane Optic Facts
Focal plane scopes (FFP) include the reticle in front of the magnification lens. These types of scopes are useful for:
- Quick acquisition, long distance types of shooting
- Shooting situations where estimations are very little
- Experienced shooters who know their aim point “hold over” and “lead” ratios for their rifles
- Shooters who don’t mind the reticle is bigger and requires more visual eyesight space than a SFP reticle
Second Focal Plane Scope Facts
Second focal plane scopes (SFP) feature the reticle to the rear of the magnifying lens. This triggers the reticle to stay at the exact same overall size in connection with the amount of zoom being used. The end result is that the reticle dimensions evolve based on the zoom used to shoot over greater ranges since the reticle markings present distinct increments which differ with the zoom level. In the FFP example with the SFP optic, the 5x “zoom” 100 yard tick reticle measurement would be 1/5th of the non “zoom” tick reticle measurement. These varieties of optics are handy for:
- Far away forms of shooting where shooters have more time to make ballistic calculations
- Shooting where most of the shots take place within shorter ranges and distances
- Shooters who would like a clearer optic sight picture with less area used up by the bigger FFP reticle
Magnification for Rifle Optics
The extent of scope magnification you need depends on the kind of shooting you intend to do. Almost every style of rifle optic gives some degree of zoom. The level of magnification a scope provides is established by the diameter, thickness, and curves of the lens glass inside of the rifle scope. The zoom of the optic is the “power” of the scope. This indicates what the shooter is looking at through the scope is magnified times the power factor of what can typically be seen by human eyes.
About Fixed Power Lens Rifle Glass
A single power rifle optic and scope will have a zoom number designator like 4×32. This indicates the magnification power of the scope is 4x power while the objective lens is 32mm. The magnification of this type of scope can not adjust since it is set from the factory.
Adjustable Power Lens Glass Details
Variable power rifle scopes use variable power levels. The power change is achieved by the power ring part of the scope near the back of the scope by the eye bell.
Scope Power and Ranges
Here are some recommended scope powers and the distances where they can be effectively used. High power glass will not be as useful as lower magnification level scopes considering too much magnification can be a negative aspect depending on your shooting distance. The very same idea goes for longer ranges where the shooter needs to have increased power to see exactly where to properly aim the rifle at the target.
About Lens Coverings
All modern rifle scope and optic lenses are layered. There are various types and qualities of lens coverings. When shopping for luxury rifle optics and scope setups, Lens finishing can be a very important aspect of defining the rifle’s capability. The lenses are one of the most significant components of the scope as they are what your eye looks through while sighting a rifle in on the point of impact. The finishing on the lenses shields the lens surface and even assists with anti glare from refracted sunrays and color visibility.
ED Versus HD Scopes
Some rifle scope manufacturers will also use “HD” or high-definition lens finishings which use various procedures, polarizations, aspects, and chemicals to draw out different colors and viewable target visibility through lenses. This HD finish is typically used with increased density lens glass which lowers light’s capability to refract by means of the lens glass. Some scope brands use “HD” to describe “ED” suggesting extra-low dispersion glass. ED handles how certain colors are represented on the chromatic spectrum and the chromatic aberration or difference which is similarly called color distortion or fringing. Chromatic aberration may be noticeable around things with hard edges and shapes as light hits the object from various angles.
Single Finishing Versus Multi-Coating for Glass
Different optic lenses can even have various coverings applied to them. All lenses usually have at least some type of treatment or finish applied to them before they are used in a rifle scope or optic. This is due to the fact that the lens isn’t just a raw piece of glass. It is part of the carefully tuned optic. It must have a finishing put on it so that it will be efficiently functional in numerous types of environments, degrees of light (full light VS shade), and other shooting conditions.
This lens treatment can protect the lens from scratches while decreasing glare and other less useful things experienced in the shooting environment while sighting in with the scope. The quality of a single coated lens depends on the scope manufacturer and how much you paid for it.
Some scope manufacturers also make it a point to specify if their optic lenses are layered or “multi” covered. This implies the lens has several treatments applied to the surfaces. If a lens gets multiple treatments, it can prove that a maker is taking multiple steps to combat different environmental elements like an anti-glare finishing, a scratch resistant anti-abrasion covering, followed by a hydrophilic covering. This additionally does not always indicate the multi-coated lens is better than a single layered lens. Being “much better” is dependent on the manufacturer’s lens treatment solutions and the quality of glass used in building the rifle glass.
Anti-water Covering for Optics
Water on a scope’s lens does not assist with maintaining a clear sight picture through a scope at all. Lots of top of the line and high-end optic producers will coat their lenses with a hydrophobic or hydrophilic coating. The Steiner Optics Nano-Protection is a good example of this sort of treatment. It deals with the exterior of the Steiner optic lens so the H2O molecules can not bind to it or create surface tension. The outcome is that the water beads roll off of the scope to maintain a clear, water free sight picture.
Rifle Optic Mounting Alternatives
Installing solutions for scopes can be found in a couple of choices. There are the standard scope rings which are separately installed to the scope and one-piece mounts which cradle the scope. These different kinds of mounts also generally can be found in quick release versions which use toss levers which allow rifle operators to rapidly mount and remove the scope.
Hex Key Optic 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 different rings to support the optic, and are often made from 7075 T6 billet aluminum which are created for long range precision shooting. This type of scope mount is great for rifles which need a durable, sound mounting solution which will not move no matter how much the scope is moved or abused.
Quick-Release Cantilever Glass 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 switched 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 connect securely to a flat top design Picatinny rail. This enables the scope to be sighted in while on the rifle, removed from the rifle, and remounted while preserving accuracy. These kinds of mounts are useful and convenient for shooting platforms which are transported a lot, to take off the glass from the rifle for protection, or for sight systems which are utilized between several rifles. An example of this mount style is the 30mm mount from Vortex Optics. It generally costs around $250 USD
Sealing and Gas Purging for Scope Tubes
Wetness inside your rifle scope can mess up a day of shooting and your pricey optic by bringing about fogging and creating residue inside of the scope tube. A lot of scopes prevent moisture from entering the scope tube with a system of sealing O-rings which are water resistant.
Rifle Optic Gas Purging
Another part of preventing the accumulation of wetness within the rifle scope tube is filling the tube with a gas like nitrogen. Given that this space is already taken up by the gas, the glass is less impacted by climate shifts and pressure variations from the outside environment which might possibly enable water vapor to leak in around the seals to fill the vacuum which would otherwise be there. These are good qualities of a decent rifle scope to look for.
