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Matte black 4-12x40 riflescope with BDC reticle and capped turrets

Vortex Optics

Vortex Optics Diamondback 4-12x40 BDC Riflescope

SKU CH-V15K-HB3HV

A 4-12x40 riflescope with Dead-Hold BDC reticle for accurate hold-over at varying ranges

  • PartDBK-04-BDC
  • TypeRifle Scopes
  • SpecificationsEye Relief 3.1-3.4 inches
  • Night VisionNo
  • Field of View32.4-11.3 feet/100 yards
  • Global SportHunting
  • Variable 4-12x magnification adapts to close and distant targets
  • Fully multi-coated lenses increase light transmission for brighter images
  • Dead-Hold BDC reticle eliminates guesswork on hold-over and windage
  • 1-3.4 inch eye relief provides comfortable viewing distance
  • 4-11.3 feet field of view at 100 yards tracks moving game

What this riflescope does

The Vortex Diamondback 4-12x40 is a variable-power optic built for hunting big game, predator, varmint, muzzleloader and slug-shotgun scenarios. Its 40 mm objective lens and fully multi-coated glass maximise light transmission in low light. The Dead-Hold BDC reticle reduces guesswork on hold-over and windage across changing distances.

The specification that decides fit

Eye relief sits at 3.1 to 3.4 inches, so the scope must be mounted where your shooting position naturally places your eye that far back. Parallax is fixed at 100 yards and the 1-inch tube accepts standard rings. If your rifle demands longer relief or adjustable parallax, this model will not match.

Installing and common pitfalls

A single-piece 1-inch tube simplifies ring alignment, and capped 1/4 MOA turrets with 15 MOA per rotation keep adjustments secure in the field. Total elevation and windage travel reach 60 MOA each. The most frequent issue is discovering too late that the fixed 100-yard parallax leaves a blurry image at much closer or farther ranges.

Highlights

  • Variable 4-12x magnification adapts to close and distant targets
  • Fully multi-coated lenses increase light transmission for brighter images
  • Dead-Hold BDC reticle eliminates guesswork on hold-over and windage
  • 1-3.4 inch eye relief provides comfortable viewing distance
  • 4-11.3 feet field of view at 100 yards tracks moving game

Specifications

BrandVortex
ModelDiamondback 4-12x40
PartDBK-04-BDC
TypeRifle Scopes
SpecificationsEye Relief 3.1-3.4 inches
Night VisionNo
Field of View32.4-11.3 feet/100 yards
Global SportHunting
Objective Lens40mm
Total Magnification12x
FeaturesFully Multi-Coated Lenses - Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces.

Questions about this item

How does the 4-12x magnification range perform on a hunting rifle at typical distances?

The variable 4-12x zoom lets you scan wide at 4x with a 32.4 ft field of view, then dial to 12x for precise shot placement on distant game.

What does the 1/4 MOA capped turret adjustment actually deliver in the field?

Each click moves point of impact 1/4 MOA, with 15 MOA per full rotation and 60 MOA total elevation and windage travel, parallax fixed at 100 yards.

Will the 1-inch tube and 12-inch length fit standard rings on my bolt-action rifle?

The 1-inch single-piece tube matches common ring sets, 12-inch overall length clears most actions, and 3.1-3.4 inch eye relief gives safe recoil clearance.

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