The Vortex Viper HD 10x42 is a roof prism binocular with 10x magnification and 42 mm objective lenses. It uses HD (High Density) extra-low dispersion glass for resolution and color fidelity. XR Fully Multi-Coating is applied to all air-to-glass surfaces to increase light transmission, and the prisms have multi-layer dielectric coatings and a phase correction coating for brightness, color accuracy, resolution and contrast.
Waterproof O-ring seals keep moisture, dust and debris out, and argon gas purging prevents internal fogging over a wide range of temperatures. ArmorTek, a hard, scratch-resistant coating, protects the exterior lenses from scratches, oil and dirt. The rubber-armored body gives a non-slip grip, and the short-hinge design is meant to improve handling and ergonomics.
The eyecups move up and down and stop at intermediate settings, so the binoculars can be used with or without eyeglasses. A center focus wheel adjusts both barrels at once. A locking diopter on the right eyepiece adjusts for differences between the user's eyes. The binoculars can be mounted on a tripod or a car window mount with a tripod adapter.
- Magnification
- 10x
- Objective lens
- 42 mm
- Prism type
- Roof
- Field of view
- 341 ft at 1000 yd / 113.2 m at 1000 m
- Angle of view
- 6.5° (actual)
- Exit pupil
- 4.2 mm
- Eye relief
- 17 mm
- Min. focus distance
- 6.5 ft / 2 m
- Focus type
- Center focus wheel
- Interpupillary distance
- 56-75 mm / 2.2-3.0 in
- Coatings
- XR Fully Multi-Coating, multi-layer dielectric prism coatings, phase correction coating, ArmorTek on exterior lenses