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Vortex Diamondback 4-12×40 Optics Riflescopes Review

Vortex Diamondback 4-12×40 Optics Riflescopes Review

If you are an avid hunter, you can take your passion to the next level. The type of shooting does not matter that you enjoy – hunting or target. But, you can make your accuracy better with a high-quality riflescope. There are numerous optics brands out in the market, but you must pick one that excels in quality manufacturing.

Vortex has been in this industry for more than a decade. The Vortex Diamondback 4-12×40 comes with many attractive features which could be ideal for long-range shooting. Its lens is capable of performing 95 % light transmission because of the multi-layer coating. The 4-12 x 40 Diamondback has a field of view of 32.4 ft to11.3 feet at 100 yards. The main tube is 30mm, and its construction can maximize alignment for better accuracy to provide an optimum visual experience.

Vortex Diamondback 4-12×40 Second Focal Plane Riflescopes Explained

The Vortex Diamondback 4-12×40 scope measures in at 12.8 inches in length. This Vortex optics has a 40mm thick objective lens with a variable power in magnification range from 4x to 12x. It is made out of solid aircraft-grade aluminum block making the scope durable and extremely impervious to magnum recoil. Lenses of these 4-12×40 Vortex scopes are thoroughly multi-coated which provides crystal clear and sharp images even in dim light conditions.

The fast focus eyepiece allows shooters reticle focusing with ease allowing it to use correctly. It results in a fastest agile target will not escape while trying to get the catch of it. The Vortex Diamondback 4 12×40 BDC focusing Dead-hold reticle is decent due to the fast focus eye-piece at variable ranges for any hunting or shooting in harsh environments. Capped precision turrets allow users to re-index turrets to zero resets after firearms sight-in the rifles. A precise glide erector system provides tracking and reiterating with accuracy. The Diamondback 4x12x40 scope features elevation and windage dials adjustments with audible clicks.

This item comes with Argon filling, and O-ring sealed which ensures this scope will deliver waterproof and fog proof performance for the rest of the life. So, it becomes practically weather-proof to the enthusiasts which make achieving their goal easy in all weather conditions, and it does not need to clean every time after use.


  • Product Dimensions 13.6-in x 3.4-in x 2.4-in
  • Item Weight 14.6 oz.
  • Tube Size 1 inch
  • Color Scheme Black Matte
  • Model Number DBK-04-BDC
  • Magnification 4x to 12x
  • Objective Lens Diameter 40mm
  • Eye Relief 3.1 inches
  • Field of View 32.4-11.3 feet/ 100 yards
  • Adjustment Graduation 1/4 MOA
  • Travel per Rotation 15 MOA
  • Elevation /Windage Click Rate 60 MOA
  • Turret Style Capped
  • Parallax Setting 100 yards


  • Constructed from aircraft-grade aluminum for durability and performance
  • Multi-coated lenses transmit a massive amount of light to offer a brighter image
  • Precision-Glide erector system ensures smooth magnification changes in rough environments
  • Capped precision turrets allow for resets turrets to zero after sight-in rifles
  • Ideal for big game, predator and varmint hunting, slug shotgun for hunting large game, or other long-range applications
  • Argon gas filling shrugs off fogging and repelling to water
  • O-ring seals keep out dampness, dust, and debris


  • It may take some extra time than usual to adjust the reset turrets
  • The elevation dial comes with some consistency issues

Whom is Vortex Diamondback 4-12×40 for?

The Diamondback 4-12×40 is loaded with tons of features making it the perfect match for fervid hunters! This riflescope is one comes with various configurations in their lineup. The Diamondback 4-12x40mm by Vortex Optics is splendid for any long-range shooting. It can be useful for big game hunting or a single day at the local spot range. This item is suitable for predator and varmint hunting, muzzleloader, slug shotgun for hunting big game or any long-range application.


Question: What is the “Precision Glide erector” system?
Answer: It is a zoom system of specially designed components that delivers comfortable magnification changes and smooth transition under the toughest situations.

Question: What is the BDC focusing Dead-Hold reticle?
Answer: It is a customized design feature stadia marks along the crosshairs on the reticle. It helps remove guesswork on holdovers at precise yardages and windage compensation.

Question: Does this riflescope come equipped with zero reset turrets?
Answer: No. This Vortex scope has no zero-stop feature. If you want to buy an additional feature, you need to go for a scope with exposed turrets.

Our Remarks

Before I go, it is completely my pleasure to help you out with an effective and one of the best, I hope, Vortex scope reviews, and finish it with some buying recommendations. The features of Diamondback 4-12×40 are quite impressive, and you will be just blown away having asked for the price. A riflescope with all the necessary features which a hunter seeks comes in at such a price point, quite astounding!

You can consider the Nikon ProStaff 4-12×40 with the same specifications which cost slightly more than the Vortex. It comes with optical prowess which ensures Nikon’s quality. It also has an effective, fast focus eye-piece. If you are budget or range conscious, then you can just rely on the Diamondback 4 12×40. It is a great catch for your bucks. It is compatible with the Diamondback AR-15. As seen in several Vortex scope reviews or other in this category, this item is a good catch for both its value and features.

About the author

Toby Daniels

A Camouflage Hunter

This is Toby saying hello to biking dudes. A commuter and a stunt perforer (an amateur) best describe me. Although I’m not an MTB specialist like my buddy James, I tried every kind/style only to see what suits me and gives pleasure. Out of curiosity, I took a short course on biking mechanism, troubleshooting, and maintenance at Broadway Bicycle School. Thus, my experience combines my working knowledge to make me feel it right to share my expertise with others and cooperate with my fellow commuters. Let’s look at some of my articles.

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