Riflescope Tech

A riflescope indicates a bullet’s point of impact and makes distant targets and surrounding objects appear closer. A riflescope is recommended for safer, more accurate shooting in the field and on the range.


The inner workings of a scope have a direct affect on shooting accuracy. As adjustments are made during sight-in, the cam tube, which holds the reticle and lenses in place, moves inside the scope. To stay on target and produce a quality image, this tube must be strong enough to absorb the impact of heavy recoil during shooting and remain in place. When selecting your riflescope, look for precision (positive) adjustments, point-of-impact consistency, reticle strength and waterproof, fogproof and shockproof durability. You’ll also want to consider weight, bulk and ergonomics, which are especially important during long days in the field.

How to Choose

A quality riflescope is the key to a successful day at the range or in the field. Riflescopes bring distant targets and surrounding objects up close and personal, allowing safer, more accurate shooting. They gather and utilize available light, making it possible to shoot in lower-light conditions and allowing the hunter to hunt from dawn to dusk.

Pairing the correct riflescope with your gun and ammunition will help you get the most out of each and every shot. Selecting the optimum scope to fit your needs involves a number of considerations, from mechanics and construction to image quality and magnification. Keep in mind when and where you shoot most often and choose a riflescope with features that best fit the requirements of your particular sport.

Riflescope Anatomy Riflescope Terminology & Technologies

Coated Optics

Coatings on lens surfaces reduce light loss and glare due to reflection for a brighter, higher-contrast image with reduced eye strain. Bushnell® riflescopes are coated with a microscopic film of magnesium fluoride. More coatings lead to better light transmission.

Types of Lens Coatings

Coated: A single layer on at least one lens surface.
Fully Coated: A single layer on all air-to-glass surfaces.
Multi-Coated: Multiple layers on all lens surfaces.
Fully Multi-Coated: Multiple layers on all air-to-glass surfaces.

Exit Pupil

The size of the column of light that leaves the eyepiece of a scope. The larger the exit pupil, the brighter the image. To determine the size, divide the objective lens diameter by the power (a 4x 32 model has an exit pupil of 8mm).

Eye Relief

The distance a scope can be held away from the eye and still present the full field of view. Bushnell riflescopes provide an extra margin of comfort and recoil safety with extended eye relief and soft neoprene eyepiece guards.

Field of View (F.O.V.)

The side-to-side measurement of the circular viewing field or subject area. It is defined by the width in feet or meters of the area visible at 100 yards or meters. A wide field of view makes it easier to spot game and track moving targets. Generally, the higher the magnification, the narrower the field of view.

Image Quality

For optimum image quality, it is important that the optical system of a riflescope delivers as much light as possible to the eye of the shooter. The lighter or brighter the image, the sharper the resolution and the clearer the shot. The quality of the glass, lens design and optical coatings all contribute to a riflescope’s ability to manage light effectively.

When selecting your scope, consider magnification, objective lens size, exit pupil, resolution, field of view and eye relief.


Choose a riflescope with the magnification or power that is appropriate for your particular application.

Low Power:
(examples: 1.5–6x 32mm, 2–7x 32mm) These riflescopes are ideal at close range and for shooting moving targets. They provide the most effective light management and produce a brighter sight picture and wider field of view – even in low-light conditions and thick brush.

Medium Power:
(examples: 3–9x 40mm, 2.5–10x 50mm) Select these riflescopes for hunting big game at medium range.

High Power:
(examples: 6–18x 40mm, 6–24x 40mm) These riflescopes are best for target shooting when the target is motionless, and for varmints and other small game.

Objective Lens Size

The second number in the formula (4x 32mm) is the diameter of the objective or front lens in millimeters. The larger the objective lens, the more light that enters the scope, and the brighter the image.

Ocular Lens

The lens closest to your eye.


A condition that occurs when the image is not focused precisely on the reticle plane. Parallax is visible as an apparent movement between the reticle and the target when the shooter moves his head, or in extreme cases, as an out-of-focus image.

Precision Adjustments

The windage and elevation adjustments affect accuracy. Windage is the horizontal (left-to-right) adjustment, usually the side turret of the scope. Elevation is the vertical (up-and-down) adjustment, usually the top turret of the scope

Bushnell scopes feature 1/4 MOA (1/4” at 100 yards) or finer windage and elevation adjustments with audible clicks for greater precision.

RainGuard® HD

This permanent, patented, hydrophobic and oleophobic lens coating prevents fogging by causing condensation from rain, sleet, snow or even your own breath to bead up into much smaller droplets than on standard coatings. Smaller droplets scatter less light, which results in a clearer, brighter view.

Now the hunter won’t miss the shot of a lifetime because of rain or accidentally breathing on his eyepiece.


Resolution, or definition, is the ability of a scope to distinguish fine detail and retain clarity.

Rugged Body Construction

Bushnell riflescopes use a high-durability aluminum alloy. They are also anodize-finished and are sealed to protect the inside from the elements. Each riflescope is rustproof, virtually scratchproof and a beautiful complement to the most expensive firearm.

Sealed, Waterproof and Fogproof

Bushnell riflescopes remain crystal clear in all types of weather. All 1” and 30mm diameter riflescopes are not only nitrogen purged to remove any vestige of internal moisture, but they are also O-ring sealed to prevent the entry of dust or moisture.

Bushnell Riflescope