Description
Rifle Scope Product Details
SIH39X40MD, SI Series Riflescope
Sightron SIH 3-9×40 MDFeatures:- Finger Adjustable Windage & Elevation- All Weather Construction- SIH Series Multi-Coating- Fast Focus EyebellSpecifications:- Magnification: 3-9X- Object Diameter: 40mm- Field of View (Feet at 100 Yards): 37.3′ – 11.7′- Eye Relief: 3.0″ – 3.9″- Reticle Type: Mil-Dot- Click Value (100 Yards): 1/4 MOA- Minutes Per Revolution: 15 MOA- Windage/Elevation Travel (100 Yards): 70 MOA- Knob Style: Hunting- Parallax: Fixed at 100 yards- Finish: Matte Black- Waterproof: Yes- Fully Multi Coated: Yes- Weight: 15.0 oz.- Length: “- Tube Diameter: 1”- Sunshade Included: No- Lens Cover Included: Yes- Illuminated Reticle: Nomanufacturer no: 31003bar code: 793139310033manufacturer : Sightronshipping dimensions: weight: dimensional weight: (w) x3 (h) (d)
Rifle Scope Product Features
X-Large
About the BigTProducts Scope Maker
BigTProducts is a premium company for long gun scopes, optics, mounting solutions, and other add-ons used for firearms like rifles and long guns. They create and manufacture their scopes and related products using building materials which are long lasting and durable. This includes the SIH39X40MD, SI Series Riflescope by BigTProducts. For additional shooting products, visit their site.
Glass Details
Rifle scopes permit you to exactly align a rifle at various targets by lining up your eye with the target at range. They accomplish this through zoom by employing a set of lenses inside the scope. The scope’s alignment can be adapted to account for different natural factors like wind and elevation decreases to make up for bullet drop.
The scope’s purpose is to understand exactly where the bullet will hit based upon the sight picture you are viewing using the scope as you align the scope’s crosshair or reticle with the target. The majority of modern rifle optics have about eleven parts which are arranged inside and outside of the scope. These scope parts consist of the rifle scope’s body, lenses, adjustment dials, objective focus rings, and other elements. See all eleven parts of a rifle scope.
Rifle Scope Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. Going for the perfect type of rifle optic is based around what type of shooting you plan on doing.
Info on First Focal Plane Scopes
Focal plane scopes (FFP) feature the reticle in front of the zoom lens. These kinds of scopes are beneficial for:
- Quick acquisition, long distance types of shooting
- Shooting situations where calculations are very little
- Experienced shooters who recognize their aim point “hold over” as well as “lead” relationships for their firearm
- Shooters who don’t mind the reticle is enlarged and uses up more visual sight area than a SFP reticle
Info About Second Focal Plane Optics
Second focal plane glass (SFP) come with the reticle behind the magnification lens. This induces the reticle to remain at the exact same dimensions relative to the level of zoom being used. The result is that the reticle measurements evolve based on the magnification applied to shoot over greater distances due to the fact that the markings present distinct increments which fluctuate with the magnification level. In the FFP example with the SFP glass, the 5x “zoom” 100 yard tick would be 1/5th of the non “zoom” tick measurement. These types of glass are handy for:
- Far away forms of shooting where shooters have extra time to make ballistic calculations
- Shooting where most of the shots occur within shorter proximities and ranges
- Shooters who choose a clearer optic sight picture with less space taken up by the larger size FFP reticle
Magnification for Optics
The quantity of scope zoom you require depends on the sort of shooting you would like to do. Just about every style of rifle scope delivers some level of magnification. The volume of zoom a scope supplies is established by the dimension, density, and curves of the lenses within the rifle optic. The magnification of the scope is the “power” of the scope. This means what the shooter is looking at through the scope is magnified times the power element of what can typically be seen by human eyes.
Info on Single Power Lens Scopes
A single power rifle optic or scope will have a magnification number designator like 4×32. This indicates the zoom power of the scope is 4x power and the objective lens is 32mm. The zoom of this type of optic can not change given that it is fixed.
Info on Adjustable Power Lens Glass
Variable power rifle scopes can be modified between magnified levels. The power modification is achieved by using the power ring part of the scope near the back of the scope by the eye bell.
Optic Power Level and Range Correlation
Here are some advised scope power levels and the distances where they may be successfully used. High power rifle scope glass will not be as beneficial as lower magnification glass considering too much magnification can be a negative aspect depending on your shooting distance. The very same idea relates to longer ranges where the shooter needs increased power to see precisely where to best aim the rifle at the target.
Lens Covering for Rifle Optics
All present day rifle optic lenses are layered. Lens covering is an important aspect of a rifle’s setup when purchasing high end rifle optics and scope setups.
HD Versus ED Lens Coatings
Some scope brands likewise use “HD” or high-definition lens finishings which use different processes, chemicals, polarizations, and elements to draw out different colors and viewable definition through the lens. Some scope producers use “HD” to refer to “ED” implying extra-low dispersion glass.
Details on Single Covering Versus Multi-Coating
Various optic lenses can likewise have different finishes used to them. All lenses generally have at least some type of treatment or finishing applied to them before they are used in a rifle scope or optic.
This lens treatment can offer protection to the lens from scratches while decreasing glare and other less helpful 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 producers also make it a point to specify if their optic lenses are coated or “multi” covered. This means the lens has had multiple treatments applied to the surfaces. If a lens gets multiple treatments, it can indicate that a manufacturer is taking numerous actions to combat different environmental aspects like an anti-glare covering, a scratch resistant anti-abrasion finish, followed by a hydrophilic finishing. This also does not always indicate the multi-coated lens will perform better than a single coated lens. Being “better” depends on the maker’s lens treatment techniques and the quality of components used in building the rifle scope.
Hydrophobic Rifle Scope Lens Finish
Water on a lens does not assist with preserving a clear sight picture through a scope at all. Numerous top of the line and high-end scope makers will coat their lenses with a hydrophobic or hydrophilic anti-water finish.
Optic Mounting Options
Installing options for scopes come in a few options. There are the standard scope rings which are separately installed to the optic and one-piece mounts which cradle the scope. These different kinds of mounts also usually can be found in quick release versions which use manual levers which permit rifle shooters to rapidly mount and remove the optics.
Hex Key Rifle Glass Ring Mounting Solutions
Normal, clamp design 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 separate rings to support the optic, and are made from 7075 T6 billet aluminum which is designed for long range accuracy shooting. This type of scope install is excellent for rifles which need a durable, rock solid mounting solution which will not move no matter how much the scope is moved or abused.
Quick-Release Cantilever Scope Ring Mounts
These kinds of quick-release rifle scope mounts can be used to quickly detach a scope from a rifle and reattach it to a different rifle. If they all use a similar design mount, a number of scopes can often be swapped out on the range. The quick detach mount style is CNC machined from anodized 6061 T6 aluminum and the mounting levers connect securely to a flat top style Picatinny rail. This allows the scope to be sighted in while on the rifle, removed from the rifle, and remounted while maintaining the original sighting settings. These types of mounts come in practical for rifles which are transferred between vehicles a lot, to remove the scope glass from the rifle for protection, or for sight systems which are employed in between a number of rifles. An example of this mount style is the 30mm mount designed by the Vortex Optics brand. It generally costs around $250 USD
Details on Scope Tube Sealing and Gas Purging
Wetness inside your rifle optic can ruin a day of shooting and your pricey optic by bringing about fogging and producing residue inside of the scope tube. The majority of scopes avoid wetness from going into the scope tube with a system of sealing O-rings which are water resistant.
Gas Purged Rifle Glass Tubes
Another part of preventing the accumulation of wetness inside of the rifle optic tube is filling the tube with a gas like nitrogen. Since this space is currently taken up by the gas, the scope is less influenced by temperature level alterations and pressure distinctions from the outside environment which might possibly permit water vapor to seep in around the seals to fill the void which would otherwise exist. These are good qualities of a decent rifle scope to seek out.
