Last update on June 30, 2022 // Source: Amazon API
Rifle Scope Product Details
ohhunt LR 2.5-12.5X40 IR Scope Red Illumination Mil Dot Glass Etched Reticle Riflescope Tactical Optical Sights 30mm Tube Diameter
Objective Lens (mm):40
One”piece Tube: Yes
Eye Relief(inch): 3.39-4.02
Eyepiece Field of view:20
Field of View (ft@100yds) :36.4ft @ 2.5x-12.4ft @ 12.5x
Click Value:1/4 MOA
Diopter Range: +/-2
Max.Elevation/Windage(moa): 90 (Example: 50 MOA is roughly 25 MOA from center.)
Parallax Setting: 100Yds
Rifle Scope Product Features
Tactical rifle scope providing crystal clear targeting at 2.5-12.5x magnification, with a 40mm objective diameter and an eye relief of 3.39-4.02 Inches.
Glass mil-dot reticle for on-the-fly range estimation and long distance targeting.
Locking turrets with re-settable zero give audible and tactile 1/4 MOA clicks.
This tough scope is shockproof, waterproof and fog resistant.
About the ohhunt Brand
ohhunt is a premium supplier for long gun scopes, optics, mounting solutions, and other components used for guns like rifles and long guns. They style and supply their scopes and related products by making the most of materials which are long lasting and durable. This includes the ohhunt LR 2.5-12.5X40 IR Scope Red Illumination Mil Dot Glass Etched Reticle Riflescope Tactical Optical Sights 30mm Tube Diameter by ohhunt. For additional shooting goods, visit their site.
Rifle Optic Information
Rifle scopes allow you to exactly aim a rifle at different targets by lining up your eye with the target over a range. They accomplish this through magnification by using a set of lenses within the scope. The scope’s positioning can be adapted for consideration of varied environmental considerations like wind and elevation decreases to account for bullet drop.
The scope’s function is to help shooters understand precisely where the bullet will hit based on the sight picture you are seeing via the optic as you line up the scope’s crosshair or reticle with the target. Many modern rifle scopes and optics have around 11 parts which are found within and outside of the scope body. These scope parts include the rifle scope’s body, lenses, windage turrets, objective focus rings, and other components. See all eleven parts of a rifle scope.
Rifle Optic Styles
Rifle scopes can be either “first focal plane” or “second focal plane” kind of scopes. The style of focal plane an optic has establishes where the reticle or crosshair lies relative to the optic’s magnifying adjustments. It literally indicates the reticle is located behind or in front of the magnifying lens of the scope. Selecting the most beneficial form of rifle optic is based on what kind of shooting or hunting you intend on undertaking.
First Focal Plane Optic Details
Focal plane scopes (FFP) feature the reticle in front of the magnification lens. This causes the reticle to increase in size based on the amount of magnification being used. The outcome is that the reticle measurements are the same at the magnified range as they are at the non amplified distance. As an example, one tick on a mil-dot reticle at 100 yards with no “zoom” is still the same tick at one hundred yards using 5x “zoom”. These types of scopes are useful for:
- Quick acquisition, long distance types of shooting
- Shooting scenarios where calculations are minimal
- Experienced shooters who recognize their target “hold over” and also “lead” equations for their weapon
- Shooters who don’t mind the reticle is bigger and occupies more visual eyesight area than a SFP reticle
Second Focal Plane Glass
Second focal plane optics (SFP) come with the reticle behind the magnification lens. In the FFP example with the SFP scope, the 5x “zoom” 100 yard tick would be 1/5th of the non “zoom” tick measurement.
- Long distance types of shooting where shooters have additional time to make ballistic estimations
- Shooting where most shots happen within much shorter distances and ranges
- Shooters who select a clearer optic sight picture without room used up by the larger size FFP reticle
Magnification for Rifle Optics
The amount of magnification a scope provides is determined by the diameter, 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 Optics
A single power rifle optic comes with a zoom number designator like 4×32. This means the magnification power of the scope is 4x power and the objective lens is 32mm. The zoom of this type of scope can not fluctuate since it is a fixed power optic.
About Adjustable Power Lens Optics
Variable power rifle scopes use enhanced power. The power adjustment is accomplished using the power ring part of the scope near the rear of the scope by the eye bell.
Power Levels and Range
Here are some suggested scope power settings and the ranges where they can be successfully used. Remember that higher power optics and scopes will not be as effective as lower powered scopes due to the fact that excessive magnification can be a bad thing. The very same idea goes for extended ranges where the shooter needs to have sufficient power to see where to best aim the rifle.
Rifle Optic Lens Finishing
All top of the line rifle glass lenses are layered. Lens coating is an essential element of a rifle system when considering high end rifle optics and scope equipment.
HD Versus ED Lens Coatings
Some rifle glass manufacturers also use “HD” or high-def lens finishings that make the most of various procedures, polarizations, aspects, and chemicals to draw out different color ranges and viewable target visibility through lenses. This high-def finish is typically used with increased density lens glass which reduces light’s chance to refract through the lens glass. Some scope vendors use “HD” to refer to “ED” meaning extra-low dispersion glass. ED deals with how colors are presented on the chromatic spectrum and the chromatic aberration or difference which is similarly called color distortion or fringing. Chromatic aberration may be obvious over items with hard outlines as light hits the item from specific angles.
Rifle Glass Lens Single Finishing Versus Multi-Coating
Different optic lenses can also have various coatings applied to them. All lenses usually have at least some type of treatment or covering used to them prior to being used in a rifle scope or optic.
Single coated lenses have a treatment applied to them which is typically a protective and boosting multi-purpose treatment. This lens treatment can safeguard the lens from scratches while minimizing glare and other less helpful things experienced in the shooting environment while sighting in with the optic. The quality of a single coated lens depends on the scope producer and the amount you spent paying for it. The scope’s maker and cost are indications of the lens quality.
Some scope manufacturers also make it a point to specify if their optic lenses are layered or “multi” coated. This means the lens has multiple treatments applied to them. If a lens gets several treatments, it can establish that a manufacturer is taking numerous actions to combat different natural factors like an anti-glare finish, a scratch resistant anti-abrasion finish, followed by a hydrophilic finish. This also doesn’t necessarily indicate the multi-coated lens is better than a single covered lens. Being “better” is dependent on the manufacturer’s lens treatment technology and the quality of glass used in developing the rifle optic.
Optic Lens Hydrophobic Finishing
Water on a lens doesn’t assist with maintaining a clear sight picture through a scope at all. Numerous top of the line and high-end optic makers will coat their lenses with a hydrophobic or hydrophilic anti-water coating.
Choices for Installing Glass on Firearms
Mounting approaches for scopes come in a couple of options. There are the standard scope rings which are individually installed to the optic and one-piece mounts which cradle the scope. These different types of mounts also typically come in quick release variations which use throw levers which allow rifle operators to rapidly mount and remove the optics.
Hex Key Scope Rings
Basic, clamp-on type mounting optic rings use hex head screws to position to the flattop style Picatinny scope mounting rails on the tops of rifles. These varieties of scope mounts use double independent rings to support the scope, and are made from 7075 T6 billet aluminum which are designed for far away precision shooting. This type of scope mount is good for rifles which need to have a durable, hard use mount which will not shift no matter just how much the scope is moved about or jarring the rifle takes. These are the type of mounts you should have for a dedicated optics setup on a long distance scouting or competition long gun that will seldom need to be altered or recalibrated. Blue 242 Loctite threadlocker can also be used to protect against the hex screw threads from backing out after they are mounted firmly in position. An example of these mounting rings are the 30mm style made by Vortex Optics. 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 rapidly connect and take off a scope from a rifle. If they all use a comparable style mount, a number of scopes can often be switched in the field. The quick detach mount style is CNC crafted from anodized 6061 T6 aluminum and the mounting levers attach firmly to a flat top type Picatinny rail. This lets the scope to be sighted in while on the rifle, taken off of the rifle, and remounted while maintaining the original sighting settings. These kinds of mounts come in convenient for rifles which are carried a lot, to take off the optic from the rifle for protection, or for sight systems which are employed in between several rifles. An example of this mount type is the 30mm mount from Vortex Optics. It typically costs around $250 USD
About Glass Tube Sealing and Gas Purging
Wetness inside your rifle optic can spoil a day on the range and your expensive optic by resulting in fogging and making residue inside of the scope tube. Most optics prevent moisture from getting in the scope tube with a system of sealing O-rings which are waterproof. Usually, these water-resistant scopes can be submerged within 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be plenty of humidity prevention for basic use rifles, unless you anticipate taking your rifle aboard watercrafts and are worried about the optic still performing if it goes over the side and you can still rescue the firearm.
Gas Purged Rifle Scope Tubes
Another component of preventing the accumulation of wetness within the rifle optic tube is filling the tube with a gas like nitrogen. Since this area is currently occupied by the gas, the glass is less influenced by temperature shifts and pressure differences from the outdoor environment which might possibly permit water vapor to seep in around the seals to fill the void which would otherwise be there. These are good qualities of a decent rifle scope to look for.