From the manufacturer

Diamondback HD Roof Prism Binoculars

The Diamondback HD smashes the scale of price vs performance, delivering a rock-solid optic that optically punches high above its class. The included GlassPak binocular harness keeps your glass close at hand, ready to deploy at a moment's notice, all while providing protection and significantly more comfort than traditional neck straps.

Adjust Eyecups & IPD

The eyecups on the Diamondback HD binocular twist up and down so any viewer can see the full field and enjoy comfortable viewing—with or without eyeglasses. When not using eyeglasses or sunglasses, keep the eyecups fully extended. For the best viewing when wearing glasses, twist eyecups down.

The interpupillary distance (IPD) is the distance between the center of your left and right pupils. Match the IPD of your eyes and your binocular by rotating the barrels in or out until you see a single image free of shading.

Focus Your Binocular

Use the center focus and diopter to adjust for vision differences in each eye. Choose an object about 20 yards away and perform this two-step process:

Close your right eye or cover the right objective lens with your hand. Look at the object with your left eye and adjust the center focus dial until the image is in focus.
Close your left eye or cover the left objective lens with your hand and rotate the ring until the object is in focus.

Neck Strap

Attach the padded neck strap in these three simple steps.

Push a few inches of the strap through the strap attachment on the binocular.
Hold the buckle and thread the end of the strap through the buckle.
Adjust the overall length, then pull tight until strap secured within the buckle.

Lens Care

In order to enjoy the best views through your binocular, take time to regularly clean the exterior lenses:

Remove any dust or grit from lenses before wiping. Use a can of pressurized air, soft camel hair brush, or an acrylic optical brush.
Clear lenses of smudges, fingerprints, or eyelash oil. Fog the lenses with your own breath, then use a nonabrasive lens cloth to clean the lenses.

GlassPak Binocular Harness

The GlassPak Binocular Harness stores and protects your binoculars while keeping them close at hand for quick deployment. Tethers attach to your binocular for added security against accidental drops while the fully adjustable straps create a comfortable fit. Follow these steps to attach the binocular tether straps.

Thread the wide end of the binocular tether straps through the harness strap buckles.
Size to fit by adjusting the one-size-fits-all harness strap.
Thread the binocular tether straps through the strap attachments on binocular.
Thread the binocular tether straps back through the tether strap buckles to secure.

The Diamondback HD smashes the scale of price vs performance, delivering a rock-solid optic that optically punches high above its class. Linear Field of View: 393 feet/1000 yards.