Last update on February 7, 2023 // Source: Amazon API
Rifle Scope Product Details
Sun Optics USA Premium Hunting 3-9 x 40 Mono Tube/Finger Dial Windage/Elevation Scope (Matte Black)
SUN CSH3940 RFL SCP 3-9X40 MT, These Sun Optics scopes are a 1″ mono tube design. They have precise finger dial windage/elevation, precision ground, fully multi coated optics and dry nitrogen filled. They are also 100% waterproof, shockproof, fog proof. They have been magnum tested and come in black stain or matte stainless finish., Magnification: 3-9x Objective: 40mm Field of View: 35.5-13.6 Eye Relief: 3.5-2.95 Tube Diameter: 1″ Length: 12.2 Weight: 13 oz Finish: Matte Reticle: Duplex , Manufacturer: SUN OPTICS, Model: CSH3940
Rifle Scope Product Features
1-Inch Monotube design
Precise finger dial windage/elevation
Dry nitrogen filled and 100% waterproof, shockproof & fogproof
Precision ground, fully multi coated optics
About the Sun Optics USA Company
Sun Optics USA is a premium producer for weapon scopes, optics, mounts, and other add-ons used for firearms like rifles and long guns. They style and supply their mounts, scopes, and related products working with materials which are durable and long lasting. This includes the Sun Optics USA Premium Hunting 3-9 x 40 Mono Tube/Finger Dial Windage/Elevation Scope (Matte Black) by Sun Optics USA. For more shooting goods, visit their site.
Rifle Optic Facts
Rifle scopes allow you to precisely aim a rifle at various targets by aligning your eye with the target over a range. They accomplish this through magnifying the target by employing a set of lenses within the scope. The scope’s alignment can be adjusted to take into account various natural factors like wind and elevation decreases to account for bullet drop.
The scope’s purpose is to understand exactly where the bullet will hit based upon the sight picture you are seeing via the scope as you line up the scope’s crosshair or reticle with the target. The majority of modern rifle optics have around 11 parts which are found internally and on the exterior of the scope. These scope parts consist of the rifle scope’s body, lenses, adjustment dials or turrets, focus rings, and other elements. Learn about the eleven parts of glass.
Rifle Glass Varieties
Rifle scopes can be either “first focal plane” or “second focal plane” kind of scopes. The sort of focal plane a scope has decides where the reticle or crosshair lies in relation to the optic’s magnification. It actually indicates the reticle is located behind or before the magnification lens of the optic. Picking the most desired style of rifle optic is based on what sort of hunting or shooting you anticipate doing.
First Focal Plane Scopes
First focal plane scopes (FFP) feature the reticle ahead of the magnifying lens. This induces the reticle to increase in size based on the level of magnification being used. The benefit is that the reticle measurements are the same at the magnified range as they are at the non amplified range. For instance, one tick on a mil-dot reticle at 100 yards without having “zoom” is still the same tick at 100 yards with 5x “zoom”. These kinds of scopes work for:
- Quick acquisition, long distance types of shooting
- Shooting scenarios where estimations are minor
- Experienced shooters who know their aim point “hold over” as well as “lead” correlations for their long gun
- Shooters who don’t mind the reticle is bigger and uses up more visual sight area than a SFP reticle
Second Focal Plane Scope Facts
Second focal plane optics (SFP) include the reticle behind 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 kinds of shooting where shooters have extra time to make ballistic estimations
- Shooting where most shots take place within much shorter ranges and distances
- Shooters who want a clearer optic sight picture without room taken up by the larger sized FFP reticle
The measure of scope zoom you require depends upon the sort of shooting you like to do. Almost every type of rifle scope delivers some amount of magnification. The level of zoom a scope supplies is determined by the diameter, density, and curves of the lens glass within the rifle optic. The magnifying level of the scope is the “power” of the opic. This signifies what the shooter is checking out through the scope is amplified times the power factor of what can usually be seen by human eyes.
Single Power Lens Rifle Glass
A single power rifle optic uses 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 zoom of this type of scope can not change given that it is a set power scope.
Variable Power Lens Rifle Glass
Variable power rifle scopes can be adjusted between magnification levels. These types of scopes will note the zoom amount in a format such as 2-10×32. These numbers indicate the zoom of the scope can be set between 2x and 10x power. This additionally utilizes the powers in-between 2 and 10. The power adaptation is achieved by making use of the power ring component of the scope near the back of the scope by the eye bell.
Rifle Optic Power and Ranges
Here are some advised scope powers and the distances where they can be effectively used. Keep in mind that high power scopes and optics will not be as practical as lower magnification level scopes since increased magnification can be a detractor. The very same idea relates to longer ranges where the shooter needs sufficient power to see where to best aim the rifle at the target.
Details on Scope Lens Finishes
All present day rifle scope lenses are coated. Lens coating can be a significant element of a shooting system when looking into high end rifle optics and scope setups.
HD Versus ED Rifle Glass Lens Coatings
Some glass suppliers additionally use “HD” or high-definition glass finishes which use various procedures, polarizations, chemicals, and elements to draw out various colors and viewable target definition through lenses. This high-definition finish is normally used with increased density lens glass which brings down light’s opportunity to refract through the lens glass. Some scope producers use “HD” to refer to “ED” suggesting extra-low dispersion glass. ED deals with how certain colors are presented on the chroma spectrum and the chromatic aberration or deviance which is also called color distortion or fringing. Chromatic aberration is often noticeable over items with hard shapes as light hits the object from specific angles.
Info on Single Finishing Versus Multi-Coating
Various optic lenses can likewise have various finishings applied to them. All lenses typically have at least some type of treatment or covering used to them prior to being used in a rifle scope or optic.
This lens treatment can protect the lens from scratches while minimizing 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 producer and how much you paid for it.
Some scope producers similarly make it a point to define if their optic lenses are covered or “multi” covered. Being “better” depends on the producer’s lens treatment innovation and the quality of products used in constructing the rifle scope.
Anti-water Optic Lens Finish
Water on a lens does not improve retaining a clear sight picture through an optic at all. Many top of the line and high-end optic manufacturers will coat their lenses with a hydrophilic or hydrophobic covering. The Steiner Optics Nano-Protection is a good example of this type of treatment. It treats the exterior surfaces of the Steiner optic lens so the water molecules can not bind to it or create surface tension. The result is that the water beads sheet off of the scope to preserve a clear, water free sight picture.
Rifle Glass Installing Options
Installing options for scopes come in a few choices. There are the standard scope rings which are separately installed to the optic and one-piece scope mounts which cradle the scope. These various kinds of mounts also normally come in quick release versions which use toss levers which enable rifle shooters to quickly mount and dismount the scope.
Hex Key Optic Rings
Standard, clamp design 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 separate rings to support the optic, and are made from 7075 T6 billet aluminum which are created for long range accuracy shooting. This type of scope mount is wonderful for rifles which require a long lasting, sound mount which will not move no matter how much the scope is moved or abuse the rifle takes.
Quick-Release Cantilever Rifle Glass Rings
These types of quick-release rifle scope mounts can be used to rapidly attach and remove a scope from a rifle before reattaching it to a different rifle. Numerous scopes can also be swapped out if they all use a similar 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 scopes which are used between numerous rifles.
Optic Tube Sealing and Gas Purging
Moisture inside your rifle optic can ruin a day of shooting and your pricey optic by bringing about fogging and creating residue inside of the scope tube. The majority of scopes avoid moisture from entering the scope tube with a system of sealing O-rings which are water resistant.
Gas Purged Rifle Optic Tubes
Another element of preventing the buildup of wetness inside of 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 differences from the outside environment which might potentially enable 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.