Vortex Optics Diamondback HP Second Focal Plane Riflescopes The Diamondback HP 4-16x42 builds upon the Diamondback series with additional features for hunters and shooters to appreciate. Dead-Hold BDC reticle is good for any hunting or shooting at varying ranges where estimating hold-over would be a concern. Extra-low dispersion glass and XR fully multi-coated lenses result in a sharper, clearer picture with increased light transmission. A 4x zoom range extends magnification versatility. The side focus is easily accessible from shooting position providing optimal image focus and parallax removal. The fast focus eyepiece allows for quick and easy reticle focusing. Finger adjustable capped reset turrets can be reset to zero after sighting in. Strong o-ring seals, nitrogen purging, and shockproof construction guarantees rugged, waterproof and fogproof performance.