Electronic Features, Bore Sighting and Zeroing

ELECTRONIC FEATURES

All electronic controls are push-button switches located at the rear of the unit housing as shown in Figure 1. To ensure proper operation of the push button switches we recommend pressing firmly on the center of the switch.

1. ON/Auto Battery Check

Depressing the Up Arrow push-button switch will turn the sight ON. The sight will automatically perform a battery check every time it is turned on. If the batteries have less than 20% of life left, the sight will turn on with the reticle image blinking on and off for 5 seconds. If the remaining battery life is more than 20%, the sight will turn on with a steady reticle pattern. The battery condition can be checked any time by turning the sight off and back on.

2. OFF

To turn the sight off, depress both UP and DOWN arrows simultaneously. Verify by looking through heads-up display window.

3. Brightness Adjustment

Push-button switches vary the brightness intensity of the holographic reticle pattern. Depressing and releasing the push-button switches moves the brightness level UP or DOWN one (1) step from the previous setting. Depressing and holding the up arrow or down arrow switch will change brightness level up or down continuously in steps. There are twenty (20) brightness settings providing a dynamic range of 20,000:1 from the lowest setting to the highest setting. When the sight is turned ON, the brightness intensity level is automatically set to Level 12.

4. Auto Shutdown

The BUSHNELL HOLOsight is equipped with auto shutdown capability and will automatically shut itself OFF 8 hours after the last push-button control is used.

MOUNTING

The BUSHNELL HOLOsight is equipped with mounting hardware to attach to a standard 1" dovetail or Weaver® style rail. To achieve the best results and accuracy, the BUSHNELL HOLOsight must be mounted properly. The 1" dovetail rail needs to be as parallel as possible to the bore to achieve the best accuracy. We strongly recommend you have the dovetail rail installed by a qualified gunsmith. Should you decide to install the mount and sight yourself, please follow these steps:

1.Use a high-quality 1" steel dovetail rail mount designed to fit your particular firearm.

2.Carefully follow the instructions packed with the dovetail rail mount you have selected. Pay careful attention to aligning the dovetail base parallel to the bore of the firearm.

3.The dovetail base should be mounted as low as possible.

4.Locate the post and dovetail clamp on the underside of the sight. Loosen the hex nut retainer screw and the dovetail clamp with an Allen wrench (7/64).

5.Place the post within a groove on the top of the 1" dovetail base. Individual preference and the specific firearm determines the optimal positioning to any specific groove on the dovetail base.

6.Make sure the post is inserted fully into the mount’s groove and push the sight as far forward as possible. Tighten hex nut and retainer screw.

NOTE: Loosen screw just enough to mount and dis-mount the sight. Do not back screw out completely to avoid losing the Weaver lock hardware.

BORE SIGHTING AND ZEROING

Bore sighting is a good preliminary procedure in achieving proper alignment of your sight to the firearm. If the 1" dovetail rail is not mounted parallel to the barrel, major elevation adjustments may be accomplished by shimming the dovetail base. It is important not to use the elevation adjustment of the sight for major adjustments. Your sight’s internal elevation and windage adjustments should be reserved for fine-tuning to achieve zero at the called for distance. Final zeroing of your firearm and sight should be done with live ammunition and based on your expected shooting distance. If you anticipate most of your shooting at short range, zero in at 50 yards. Groups of three shots will be useful for averaging the point of impact.

WINDAGE AND ELEVATION ADJUSTMENTS

Your BUSHNELL HOLOsight features click mechanisms for elevation and windage adjustments. The elevation and windage adjustment are located on the right-hand side of the sight (Figure 1). The knob towards the front is your windage adjustment and the knob towards the rear is your elevation adjustment (Figure 1). Both of these adjustment mechanisms are grooved with a slotted screw head and require the use of a screwdriver, coin, or spent brass to turn.

The elevation and windage adjustments are shown in Figure 3. For both elevation and windage, each click will change the bullet’s point of impact 1/2 Minute of Angle (MOA), which translates to 1/4 inch at 50 yards, 1/2 inch at 100 yards. Also, one full rotation of either knob will change your point of impact 10 MOA. This translates into 5 inches at 50 yards, 10 inches at 100 yards. To move the point of impact UP, turn the adjustment screw counterclockwise; to move the point of impact DOWN, turn the adjustment screw clockwise.

Figure 3

Elevation

Windage

To move the point of impact RIGHT, turn the adjustment screw clockwise; to move the point of impact LEFT, turn the adjustment screw counterclockwise. The elevation and windage adjustments have been initially set at the factory near the midpoint of their adjustment ranges and should be close to being at zero with a properly installed mounting rail. Please do not turn the adjustments before mounting the sight on the firearm. Be sure to check that the mount and the sight remain secured after the first shots are fired.

CAUTION-When encountering a sudden increase in resistance in these adjustments, the end of the adjustment range has been reached. DO NOT TRY to turn the adjustments any farther or serious damage may occur to the sight.

51-0021, 52-0021 specifications

The Bushnell 52-0021 and 51-0021 are exceptional binocular models that reflect the superior craftsmanship and innovative technology that Bushnell is known for. Designed for avid outdoor enthusiasts and casual observers alike, these binoculars offer a blend of performance, durability, and clarity, making them ideal for birdwatching, hunting, and sporting events.

Both models feature a high-quality roof prism design, which contributes to their compact and lightweight nature, enhancing portability without sacrificing optical quality. The nitrogen-purged construction prevents internal fogging, allowing users to maintain a clear view in varying weather conditions. This feature is particularly beneficial for those venturing into diverse environments, where humidity and temperature fluctuations can affect visibility.

The 52-0021 model is equipped with a magnification of 10x and an objective lens diameter of 42mm, offering bright and detailed images even in low light situations. The fully multi-coated optics increase light transmission, providing exceptional brightness and contrast throughout the viewing experience. It also includes a wide field of view, making it easier to track fast-moving subjects.

On the other hand, the 51-0021 model boasts a magnification of 8x with a 42mm objective lens. This model is designed for those who prefer a steadier view, reducing hand-shake effects while still delivering crisp images. The ergonomic design ensures comfortable handling for extended periods, making this model suitable for long observation sessions.

Another outstanding feature of both binoculars is their robust and waterproof construction, which allows for use in various environmental conditions without the worry of damage from rain or snow. The protective rubber armor further enhances durability, providing a secure grip while resisting impacts and abrasions.

Overall, the Bushnell 52-0021 and 51-0021 are remarkable choices for anyone seeking reliable and high-performance binoculars. With advanced optical technologies, ergonomic designs, and rugged construction, these models cater to the needs of both newcomers and seasoned users in the field of outdoor observation. Whether you are sizing up the magnificence of distant mountains or observing the subtle nuances of birdlife, these binoculars guarantee an enhanced viewing experience.