| Magnification How many times larger an object is magnified versus the naked eye. | 4-12x |
| Objective Lens Diameter The diameter of the light-gathering lens expressed in millimeters. The larger the number the better the resolution and the more light the optic lets in. | 40mm |
| Linear FOV at 100 Yards The linear field of view at the widest dimension of the circular viewing area at 100 Yards away. | 11.3-32.4 feet |
Eye Relief  Eye relief refers to the distance images are projected from the ocular lens to their focal point. |
3.1-3.4 inches |
| Tube Size | 1 inch |
| Reticle Styles | |
| Turret Style | Low profile |
| Adjustment Graduation | 1/4 MOA |
| Max Internal Elevation Adjustment | 66 MOA |
| Max Internal Windage Adjustment | 66 MOA |
| Parallax Setting | 100 yards |
| Length | 12.0 inches |
| Waterproof | Yes |
| Fog Proof | Argon gas |
| Color | Black |
| Finish | Matte |
| Weight | 14.6 ounces |
| SKU Stock Keeping Unit | DBK-.4-BDC |
| MSRP Manufacturers Suggested Retail Price | $269.00 |
Vortex Diamondback 4-12x40 Riflescope
Dead-Hold BDC Reticle
The Diamondback – loaded with features!
First, the solid one-piece aircraft-grade aluminum alloy construction makes the Diamondback riflescope virtually indestructible and highly resistant to magnum recoil. Argon purging puts waterproof and fog proof performance on the agenda, and advanced fully multi-coated optics raise an eyebrow when crystal clear, tack-sharp images appear in the crosshairs. Look for all this and more in a riflescope you'd expect to cost quite a bit more – but doesn't. We can live with that.
Experience great hunting in dense cover
Vortex knows good hunting gets all the better with high quality optics. For that reason, Vortex makes sure every glass surface of the Diamondback is fully multi-coated to transmit a full 91 percent of the light – delivering the bright details you need when taking aim.
- 4-12x40 riflescope is ideal for Big Game, Predator/Varmint, Muzzleloader, Slug, and Long Range hunting.
- Dead-Hold BDC reticle has a customized design that helps eliminate guesswork on hold-over and windage corrections. Good for any hunting or shooting at varying ranges where estimating hold-over would be a concern.
Refined. Reliable. Tough as nails.
With a Diamondback riflescope on your firearm, you'll head out with complete confidence in the harshest of habitats. The Diamondback takes great strides against the abuse of repeated recoil with a rugged one-piece main tube constructed of 6061 T6 aircraft-grade aluminum and sets high standards for waterproofing and fogproofing with argon gas purging:
- Argon gas does not absorb or react chemically with water.
- Argon gas eliminates internal fogging.
- Argon gas maintains its protective properties over a wider temperature range.
- Argon gas does not diffuse as quickly as other elements, extending the service life of the optics longer.
Watch Todd's Tundra Test video and see just how well the Viper handles water submersion, freezing temperatures, and heavy recoil. Absolutely refined, reliable, and tough as nails.
Zero reset accuracy. Machined for durability. When you hunt with the Diamondback riflescope, you can count on fast, precise windage and elevation adjustments – with audible, tactile clicks at the tips of your fingers.
The Precision-Glide Erector System of the Diamondback riflescope features premium-grade fluoropolymer teflon resin bushings that provide exceptional resistance to stress cracking, temperature change, corrosion, and fiction-induced wear. In addition, these bushings have an ultra-low coefficient of friction for the smoothest possible operation of the magnification adjustment.
Included with the Vortex Diamondback 4-12x40 Riflescope:
- Lens Cover
- Vortex VIP Lifetime Warranty