The wide -angle nature of the Razor 30x eyepiece reveals a field of view that is wider than what you would see at 30x through the 20-60x zoom eyepiece. The fixed-power design also provides slightly better resolution than the zoom eyepiece. Vortex’s ranging reticle provides precise target range estimation. Optical Features HD Lens Elements Premium (High Density) extra-low dispersion glass delivers the ultimate in resolution and color fidelity, resulting in High Definition images. XR Lens Coatings Vortex proprietary XR anti-reflective coatings, fully multi-coated on all air-to-glass lens surfaces, increase light transmission for maximum brightness. Construction Features Waterproof Optics are sealed with O-rings to prevent moisture, dust, and debris from getting inside the spotting scope. Fogproof Argon gas purging guarantees superior fogproof and waterproof performance. ArmorTek Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt. Convenience Features Adjustable Eyecup Twists up and down for comfortable viewing with or without eyeglasses. Specs Magnification: 30 x Linear Field of View: 112 feet/1000 yards Angular Field Of View: 2.1 degrees Eye Relief: 18 mm Vortex Optics Vortex Razor HD 30x R-T Tactical MRAD Eyepiece R30-R/T