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Optical Coatings: The largest limitation of light transmission in riflescopes is reflected light. Any time that light strikes a glass surface, up to 5% of the light can be reflected back. However, if a thin chemical film (commonly Magnesium Fluoride) is used to coat the surface of the glass, much of the reflection can be eliminated. The coating reduces light loss and glare, increasing light transmission and resulting in brighter, clearer images. By coating a surface with multiple films, the effect of the coating is increased, at times limiting the amount of reflected light to 0.25% to 0.5% per glass surface.
Springer Airgun Scopes: The unique recoil pattern of spring piston airguns requires the purchase of a special airgun scope. Unlike centrefire and rimfire rifles that recoil only in one direction, airguns recoil both rearward and forward. This double recoil action can damage scopes that are not designed to handle it.
When carrying your rifle for a long time, every extra ounce can weigh you down. While larger objectives and variable power have their benefits, the extra ounces quickly add up for all these features. If you are looking to minimize the weight of a rifle that you will be carrying a lot, consider a compact, fixed power scope with a medium sized objective. It will provide a large exit pupil with a bright image and weigh a lot less than a variable power scope.

The Numbers and What They Mean

Power/Magnification: Commonly a riflescope will be expressed in a series of numbers such as 3-12x50 or 10x44. The first number in this case 3-12 or 10, is the power. Power expresses the magnification as a factor compared to the naked eye. So in a fixed power scope, such as the 10x44, the object in view is magnified 10 times. An object would appear to be 10 times closer than it would with the naked eye. Therefore, a higher number has a greater magnification. Most scopes sold today are variable power, such as 3-12 or 4-16. This allows greater versatility, since in this case, the shooter can vary the magnification from 3 to up to 12, with infinite values in-between.

The magnification that you select depends on the kind of shooting you will be doing. If you are planning on shooting closer targets, you will want either a low power fixed scope such as a 4x or a variable that goes down to 3x or even lower. This will give you a wider Field of View and allow you to acquire a target quickly close up. On the other hand, if long range target shooting is in your plans, you might want a scope that goes as high as 16x or even 24x. This will allow you to see the 10-ring clearly at long distances. For all around shooting, a range of 3-12 or 4-16 will allow some serious range variation, while still dialling down for close shots.

Riflescope Guide
What does a scope do for you?
One of the main uses of a riflescope is to magnify your target, giving you a clearer sight picture than with the naked eye. This not only allows you to shoot more accurately at a greater distance, but it also increases safety since you can see the target better and what lies behind it.

A scope can also give you more hunting time early and late in the day, the two prime times for hunting. Riflescopes accentuate available light and make it possible for you to accurately shoot in low light conditions.

A riflescope also allows a higher level of precision than traditional iron sights. At 100 yards, an iron ramp sight will cover up to 6 inches of the target. Precision placement is limited by the large amount of the target that is covered. However, riflescopes use various reticles (commonly called crosshairs) that in fine target models only cover an 1/8 of an inch at 100 yards. This is the ultimate in precision, allowing you to place a shot exactly where you want every time - even in the same hole as the previous one.

With a correctly mounted and sighted in riflescope and a little practice, shooters can now make precise shots at longer distances.Type your paragraph here.

Objective: The second number in a scope, such as the 50 in a 3-9 x 50, is the diameter of the objective lens in millimetres. A 50 designation means that the outer lens is 50 mm in diameter. A larger number indicates a larger lens. Large lenses are more bulky, but they also offer a bit larger field of view and let in more light, which makes your image clearer - especially in low light conditions.

On a bright day, having a scope with a larger exit pupil will have little effect. The only difference you may notice is that you will be able to move the scope and still maintain the image. In low light, the exit pupil is the biggest factor in getting as much light as possible to your eye.

Adjustable Objective (AO): On some scopes, the objective lenses are adjustable. This allows you to focus at distances from 10 to 100 yards and adjust for a condition called Parallax. The scopes with adjustable objective lenses have markings that allow you to adjust the focus for specific ranges. Parallax occurs when viewing distant targets and the reticle appears to shift or move. This occurs when the image in the scope is in one focal plane, and the reticle is in another. Most scopes without adjustable objectives are factory set to compensate for parallax and focus at an optimum distance of 100 or 150 yards. Parallax is usually only an issue at magnification over 10x. When looking at a scope that will be used for distant targets in higher power, an adjustable objective is a good choice.

Reticle: The reticle is the aiming point within the scope - commonly called "crosshairs" due the standard arrangement being two thin wires that cross. You will want to choose a reticle that best suits your style of shooting. For example, a heavy duplex reticle would be best for a shotgun scope used in heavy brush, where fine reticles would be difficult to see.

Eye Relief: Eye relief is the comfortable distance that a scope can be held from the eye and still allow the shooter to see the entire image. It is literally the distance of your shooting eye to the eyepiece. It will usually be stated as a range, since in a variable power scope the eye relief will vary with the power. The more generous the eye relief the better. Three to four inches is a good number that will fit most shooters.

Field of View (FOV): What this means is how wide of an area (in ft.) that you can view at 100 yards. A higher number indicates a wider area, while a smaller number indicates a narrower area. As the magnification increases, a smaller FOV results. If you are looking for a scope for quick target acquisition in close cover, you will need a wider field of view and therefore, a smaller power.
Minute of Angle (MOA) is a term to designate variances on a target at 100 yards distant. Most commonly, it is used to describe the adjustment on a scope. If a scope’s adjustments are listed at 1/4" MOA, then for every click of the adjustment knob, the bullet’s point of impact will move 1/4" at 100 yards.

Windage: Windage is the term for horizontal adjustment of your scope i.e. left to right
Elevation: Elevation is the adjustment of the scope in the vertical direction i.e. up and down
Tube Diameter: The majority of the scopes on the market come with the main tube of one-inch diameter or 30mm. Contrary to popular belief, the larger tube does not allow more light to reach your eye. However, a larger tube diameter does give added strength and rigidity due to the greater cross sectional area and larger rings and mounts. A larger tube diameter also allows for an increased range of adjustment for windage and elevation.