Last update on August 9, 2022 // Source: Amazon API
Rifle Scope Product Details
U.S. Optics FDN 17X T-3
The U.S. Optics FDN-17X Riflescope, 3.2-17x50mm, 34mm Tube, FFP, HORUS T-3 Reticle, 1/10 MIL Elevation/ Windage Adjustment, Black, Medium, FDN 17X T-3 Objective Lens Diameter: 50, Magnification: 3.2 – 17, Reticle: Horus TReMoR3, Tube Diameter: 34, Reticle Focal Plane: First Focal Plane (FFP), Exit Pupil: 3, Battery Type: CR2032, Field of View, Linear: 25.25 – 8.03, Color: Matte Black, Weight: 29.6, Fabric/Material: Aluminum, Length: 15.02, Width: 3.883, Height: 2.43, Illumination Type: LED, Illumination Color: Red, Adjustment Type: Mil Rad, Adjustment Click Value: 1/10, Parallax: 50, Finish: Type III Hard Coat Anodized, Magnification Type: Variable, Condition: New, W/E Travel at 100 Yds: 20/22.
Rifle Scope Product Features
U.S. Optics FDN-17X Riflescope
3.2-17x50mm, 34mm Tube
FFP, HORUS T-3 Reticle
1/10 MIL Elevation/ Windage Adjustment
About the U.S. Optics Brand
U.S. Optics is a premium maker for rifle scopes, optics, mounting solutions, and other add-ons used for firearms like rifles and long guns. They style and build their scopes and related products by making the most of elements which are long lasting and resilient. This includes the U.S. Optics FDN 17X T-3 by U.S. Optics. For more shooting items, visit their site.
What You Need to Know About Rifle Optics
Rifle scopes permit you to precisely aim a rifle at different targets by lining up your eye with the target over a distance. They do this through zoom by employing a set of lenses within the scope. The scope’s positioning can be adjusted for the consideration of separate environmental elements like wind and elevation to account for bullet drop.
The scope’s function is to help shooters understand precisely where the bullet will land based on the sight picture you are viewing using the scope as you align the scope’s crosshair or reticle with the intended target. The majority of contemporary rifle scopes have about eleven parts which are arranged within and outside of the scope body. These parts consist of the rifle scope’s body, lenses, elevation dials, objective focus rings, and other parts. Learn about the eleven parts of scopes.
About Scope Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. The type of focal plane an optic has identifies where the reticle or crosshair is located in relation to the optic’s magnification. It literally means the reticle is located behind or in front of the magnifying lens of the scope. Deciding on the most suitable sort of rifle optic is based upon what form of shooting you anticipate undertaking.
Info on First Focal Plane Optics
Focal plane scopes (FFP) include the reticle in front of the magnification lens. These styles of scopes are beneficial for:
- Quick acquisition, far away kinds of shooting
- Shooting scenarios where calculations are marginal
- Experienced shooters who recognize their aim point “hold over” as well as “lead” equations for their firearm
- Shooters who do not mind the reticle is bigger and requires more visual eyesight space than a SFP reticle
Info About Second Focal Plane Scopes
Second focal plane scopes (SFP) come with the reticle to the rear of the magnifying lens. This induces the reticle to remain at the very same dimensions in connection with the quantity of magnification being used. The end result is that the reticle measurements change based on the zoom employed to shoot over greater distances considering that the reticle measurements present distinct increments which differ with the magnification level. In the FFP illustration with the SFP optic, the 5x “zoom” 100 yard tick reticle measurement would be 1/5th of the non “zoom” tick measurement. These particular styles of scopes work for:
- Far away types of shooting where shooters have additional time to make ballistic computations
- Shooting where most shots take place within much shorter spaces and ranges
- Shooters who select a clearer optic sight picture with less room used up by the enlarged FFP reticle
The quantity of magnification a scope provides is determined 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.
Fixed Single Power Lens Glass Info
A single power rifle scope comes with 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 type of optic can not fluctuate because it is a fixed power optic.
Variable Power Lens Rifle Scope Details
Variable power rifle scopes can be changed between magnification power levels. It will note the zoom degree in a configuration like 2-10×32. These numbers suggest the zoom of the scope can be set between 2x and 10x power. This always incorporates the powers in-between 2 and 10. The power adjustment is achieved by applying the power ring part of the scope near the back of the scope by the eye bell.
Power and Range Correlations
Here are some advised scope power settings and the distances where they can be successfully used. High power rifle scope glass will not be as effective as lower magnification level rifle scope glass because too much magnification can be a bad thing. The same concept applies to extended distances where the shooter needs to have sufficient power to see where to best aim the rifle.
About Rifle Glass Lens Covering
All modern rifle scope lenses are covered in special coatings. There are various types and qualities of glass lens coverings. Lens coating can be an essential element of a rifle’s setup when thinking about luxury rifle optics and targeting units. The glass lenses are among the most critical pieces of the glass since they are what your eye sees through while sighting a rifle in on the point of impact. The covering on the lenses safeguards the lens surface area and even assists with anti glare from excess sunshine and color presence.
HD Versus ED Lenses
Some optic manufacturers additionally use “HD” or high-definition lense finishings that apply various processes, polarizations, chemicals, and elements to enhance separate color ranges and viewable definition through lenses. This high-def coating is often used with more costly, high density glass which decreases light’s capability to refract by means of the lens glass. Some scope vendors use “HD” to refer to “ED” indicating extra-low dispersion glass. ED deals with how colors are presented on the chroma spectrum and the chromatic difference or aberration which is also called color distortion or fringing. Chromatic aberration is often visible around objects with defined shapes as light hits the object from various angles.
Single Optic Lens Finishing Versus Multi-Coating
Various optic lenses can also have various finishings applied 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.
This lens treatment can protect the lens from scratches while minimizing glare and other less beneficial things experienced in the shooting environment while sighting in with the scope. The quality of a single coated lens depends on the scope maker and how much you paid for it.
Some scope producers likewise make it a point to specify if their optic lenses are layered or “multi” covered. This means the lens has several treatments applied to them. If a lens receives several treatments, it can show that a maker is taking numerous actions to combat various natural elements like an anti-glare finishing, a scratch resistant anti-abrasion coating, followed by a hydrophilic finishing. This additionally does not necessarily indicate the multi-coated lens is much better than a single coated lens. Being “better” hinges on the producer’s lens treatment solutions and the quality of glass used in developing the rifle optic.
Hydrophobic Rifle Scope Lens Finishing
Water on a scope’s lens doesn’t assist with preserving a clear sight picture through a scope in any way. Lots of top of the line and high-end scope producers will coat their lenses with a hydrophobic or hydrophilic covering. The Steiner Optics Nano-Protection is a fine example of this kind of treatment. It treats the surface of the Steiner optic lens so the water molecules can not bind to it or produce surface tension. The result is that the water beads slide off of the scope to preserve a clear, water free sight picture.
Alternatives for Installing Rifle Optics on Long Guns
Installing options for scopes can be found in a couple of choices. There are the basic scope rings which are individually mounted to the optic and one-piece mounts which cradle the scope. These different kinds of mounts also generally can be found in quick release variations which use manual levers which allow rifle operators to rapidly install and dismount the optics.
Scope Mounts with Hex Key Rings
Standard, clamp style mounting scope rings use hex head screws to mount to the flattop style Picatinny scope mount rails on rifles. These types of scope mounts use two different rings to support the optic, and are often made from 7075 T6 billet aluminum which is developed for long range accuracy shooting. This type of scope mount is great for rifles which require a resilient, rock solid mounting solution which will not move no matter how much the scope is moved or abused.
Quick-Release Cantilever Rifle Optic Rings
These types of quick-release rifle scope mounts can be used to quickly attach and take off a scope from a rifle before reattaching it to a different rifle. Numerous scopes can even be swapped out if they all use a compatible style mount. These types of mounts are handy for long guns which are transferred a lot, to swap out the optic from the rifle for protecting the scope, or for optics which are used between multiple rifles or are situationally focused.
Sealing and Gas Purging for Optic Tubes
Moisture inside your rifle glass can wreck a day of shooting and your costly optic by inducing fogging and generating residue within the scope tube. A lot of scopes prevent humidity from entering the optical tube with a series of sealing O-rings which are waterproof. Generally, these optics can be immersed underneath 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be more than enough moisture content avoidance for standard use rifles for hunting and sporting purposes, unless you anticipate taking your rifle aboard watercrafts and are concerned about the optic still working if it falls overboard and you can still rescue the rifle.
Gas Purged Scope Tubes
Another component of preventing the accumulation of wetness inside of the rifle scope tube is filling the tube with a gas like nitrogen. Given that this space is already occupied by the gas, the scope is less impacted by condition changes and pressure variations from the external environment which might possibly allow water vapor to permeate in around the seals to fill the void which would otherwise exist. These are good qualities of a decent rifle scope to look for.