Vortex Optics 8x28 Viper R/T Tactical Water Proof Roof Prism Binocular with 6.1 Degree Angle of View & Ranging Reticle

Vortex Optics
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About Vortex Optics 8x28 Roof Prism

The Viper R/T tactical binocular combines award-winning optics and required military features to create a tough, durable roof prism binocular-reliable in the worst conditions. XD (extra-low dispersion glass) objective lenses further enhance resolution and deliver the true-to-life color accuracy so essential for identifying targets. Soldiers and hunters can range objects of known dimension with the R/T Ranging reticle, which features four human silhouettes to serve as a secondary ranging aid.

Vortex Optics 8x28 Roof Prism Features

  • XR Lens Coatings: Vortex XR proprietary anti-reflection lens coatings increase light transmission with multiple coatings on all air-to-glass surfaces.
  • XD Lens Elements: Extra-low dispersion (XD) glass enhances resolution, color and contrast.
  • Fully Multi-Coated Lenses: Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces.
  • Phase Correction: Used on roof prism models only-coating enhances resolution and contrast.
  • Roof Prisms: Valued for greater durability and a more compact size.
  • Rubber Armor: Provides a secure, non-slip grip and durable external protection.
  • Adjustable Eyecups: Fold up and down for comfortable viewing with or without eyeglasses. Flared to eliminate stray light and rotatable for a custom fit.
  • Center Focus Wheel: Adjusts the focus of both binocular barrels at the same time.
  • Right Eye Diopter: Adjusts for differences in a user's eyes. Located on the right eyepiece.
  • Waterproof: Optics are sealed with O-rings to prevent moisture, dust and debris from getting inside the binocular.
  • Fogproof: Barrels are filled with argon gas to inhibit internal fogging.
  • ArmorTek Lens Armor: Ultra-hard, scratch-resistant coating repels oils and corrosive salts on outer glass surfaces.

Vortex Optics 8x28 Roof Prism Specifications

8 x
Objective Lens Diameter
28 mm
Eye Relief
20 mm
Exit Pupil
3.5 mm
Linear Field of View
319 feet/1000 yards
Angular Field Of View
6.1 degrees
Close Focus
7.5 feet
Interpupillary Distance
56-73 mm
4.7 inches
4.5 inches
11.8 ounces

Vortex Optics 8x28 Roof Prism Reviews

Reviewed by 1 customers


Sold on Vortex


from Cleveland, OH  -  Casual/ Recreational

I was looking for a compact binocular that didn't cost too much for sporting events and touring/sight-seeing. I'd bought a less expensive one but it was unacceptable to me because I have to use binoculars with my eyeglasses and the eye relief was too shallow. I decided to spend a little more and get the Vortex Diamondback even though I hadn't heard much about the company. I'm glad I did.The Diamondback 8x28 not only has 19mm of eye relief, it also has a very nice 6.9 degree field of view. Not to mention that it's waterproof, fog proof, fully multi-coated and has BAK4 prisms. Build quality is good and the focus is smooth and accurate. The image quality is really quite good for a compact binocular. Especially at this price. What a noticeable difference between the Diamonback and the $60 one that I'd gotten before!On a side note, the first one I got had one eyecup that retracted a little too far. I decided to return it to Vortex under their VIP warranty. They emailed me a FedEx label to ship the binocular to them free of charge. They decided not to repair it but immediately shipped me a brand new one. So, the quality of the product that I bought and the really excellent warranty and service has impressed me and has me sold on Vortex.

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