Last update on March 30, 2023 // Source: Amazon API
Rifle Scope Product Details
Osprey Global Elite Series 3-30X56 First Focal Plane
Osprey’s first focal plane scopes place the glass etched reticle at the front of the erector assembly thus allowing the values to remain in proportion throughout the magnification settings.
Rifle Scope Product Features
Objective (mm): 56mm
Tube Diameter (mm): 35mm
About the Osprey Global Manufacturer
Osprey Global is a premium maker for firearm scopes, optics, mounts, and other components used for guns like rifles and long guns. They create and build their scopes and related products by choosing building materials which are long lasting and durable. This includes the Osprey Global Elite Series 3-30X56 First Focal Plane by Osprey Global. For more shooting products, visit their site.
Rifle Glass Info
Rifle scopes enable 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 using a set of lenses within the scope. The scope’s positioning can be adjusted for the consideration of different environmental elements like wind and elevation increases to make up for bullet drop.
The scope’s function is to help shooters understand exactly where the bullet will hit based upon the sight picture you are seeing with the scope as you line up the scope’s crosshair or reticle with the intended target. Many modern-day rifle scopes and optics have around 11 parts which are found inside and externally on the scope. These scope parts consist of the rifle scope’s body, lenses, windage dials or turrets, objective focus rings, and other elements. See all eleven parts of an optic.
Rifle Glass Styles
Rifle scopes can be either “first focal plane” or “second focal plane” type of optics. Choosing the finest type of rifle optic is based on what type of shooting you plan to do.
About First Focal Plane Scopes
Focal plane scopes (FFP) feature the reticle in front of the zoom lens. This induces the reticle to increase in size based on the extent of zoom being used. The benefit is that the reticle measurements are the same at the magnified range as they are at the non amplified distance. One tick on a mil-dot reticle at one hundred yards with no “zoom” is still the exact same tick at 100 yards with 5x “zoom”. These types of scopes are practical for:
- Quick acquisition, far away kinds of shooting
- Shooting scenarios where calculations are very little
- Experienced shooters who understand their target “hold over” plus “lead” ratios for their long gun
- Shooters who do not mind the reticle is enlarged and occupies more visual sight space than a SFP reticle
Second Focal Plane Glass Facts
Second focal plane scopes (SFP) come with the reticle to the rear of the zoom 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.
- Far away forms of shooting where shooters have more time to make ballistic calculations
- Shooting where most shots happen within shorter ranges and distances
- Shooters who select a clearer optic picture with less area taken up by the bigger FFP reticle
Ins and Outs of Rifle Optic Magnification
The amount of zoom a scope supplies is figured out by the diameter, density, and curvatures of the lenses inside of the rifle scope. The magnification of the scope is the “power” of the scope.
Info on Fixed Single Power Lens Rifle Optics
A single power rifle optic and scope uses a magnification 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 a fixed power scope.
Variable Power Lens Scopes
Variable power rifle scopes use enhanced power. The power modification is achieved by using the power ring part of the scope near the rear of the scope by the eye bell.
Power and Range
Here are some advised scope power levels and the ranges where they may be successfully used. Always remember that high power scopes will not be as practical as lower magnification level optics and scopes because too much zoom can be a detractor. The same concept goes for longer distances where the shooter needs to have enough power to see where to properly aim the rifle.
Lens Coating for Scopes
All modern rifle optic lenses are covered. Lens finish can be a crucial element of a shooting platform when thinking about high end rifle optics and scope systems.
ED Versus HD Rifle Scopes
Some rifle glass manufacturers will also use “HD” or high-def lens coverings that make the most of different procedures, chemicals, aspects, and polarizations to extract various color ranges and viewable target visibility through the lens. This high-def coating is often used with higher density glass which drops light’s capability to refract by means of the lens glass. Some scope suppliers use “HD” to describe “ED” implying extra-low dispersion glass. ED deals with how certain colors are represented on the chromatic spectrum and the chromatic difference or aberration which is similarly called color distortion or fringing. Chromatic aberration is often obvious over objects with hard shapes as light hits the item from various angles.
Single Finish Versus Multi-Coating for Rifle Scopes
Different optic lenses can also have various finishings used to them. All lenses typically have at least some type of treatment or finish used to them prior to being used in a rifle scope or optic.
Single layered lenses have a treatment applied to them which is typically a protective and improving multi-purpose treatment. This lens treatment can preserve the lens from scratches while reducing 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 upon the scope maker and how much money you spent on it. The scope’s maker and cost are signs of the lens quality.
Some scope makers similarly make it a point to define if their optic lenses are layered or “multi” coated. Being “much better” depends on the maker’s lens treatment innovation and the quality of materials used in constructing the rifle scope.
Optic Lens Anti-water Finishing
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 scope producers will coat their lenses with a hydrophilic or hydrophobic coating. The Steiner Optics Nano-Protection is a good example of this kind of treatment. It provides protection for the exterior surfaces of the Steiner scope lens so the water molecules can not bind to it or produce surface tension. The result is that the water beads sheet off of the scope to maintain a clear, water free sight picture.
Alternatives for Installing Rifle Scopes on Long Guns
Installing options for scopes can be found in a few choices. There are the standard scope rings which are individually installed to the scope and one-piece scope mounts which cradle the scope. These various kinds of mounts also normally are made in quick release variations which use toss levers which enable rifle shooters to rapidly mount and remove the scope.
Optic Mounts with Hex Key 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 two separate rings to support the optic, and are often made from 7075 T6 billet aluminum which are designed for long distance precision shooting. This type of scope install is perfect for rifles which require a resilient, rock solid mounting solution which will not move no matter how much the scope is moved or abuse the rifle takes.
Quick-Release Cantilever Scope Rings
These kinds of quick-release rifle scope mounts can be used to rapidly attach and take off a scope from a rifle. If they all use a comparable design mount, a number of scopes can often be switched out. The quick detach design is CNC machined from anodized 6061 T6 aluminum and the mounting levers connect solidly 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 the original sighting settings. These types of mounts come in convenient for shooting platforms which are carried a lot, to remove the glass from the rifle for protection, or for aiming systems which are utilized between numerous rifles. An example of this mount style is the 30mm mount designed by Vortex Optics. It normally costs around $250 USD
Sealing and Gas Purging for Rifle Optic Tubes
Wetness inside your rifle optic can ruin a day of shooting and your pricey optic by triggering fogging and creating residue within the scope tube. Many scopes prevent wetness from going into the optical tube with a series of sealing O-rings which are water resistant. Normally, these water resistant optics can be immersed under 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be sufficient moisture prevention for common use rifles for hunting and sporting purposes, unless you plan on taking your rifle aboard watercrafts and are worried about the scope still working if it is submerged in water and you can still recover the firearm.
Details on Optic Tube Gas Purging
Another element of avoiding the buildup of moisture within the rifle optic’s tube is filling the tube with a gas like nitrogen. Considering that this area is currently taken up by the gas, the optic is less affected by condition changes and pressure distinctions from the outside environment which might potentially enable water vapor to leak in around the seals to fill the void which would otherwise exist. These are good qualities of a decent rifle scope to seek out.