Vortex Razor HD 30x Ranging Spotting Scope Eyepiece transforms your Razor HD spotting scope from a variable magnification surveillance tool to a fixed-range spotting scope that will allow you to calculate the range to targets effortlessly and accurately. These powerful spotting scope accessories offer a potent 30x fixed zoom magnification with an extremely wide field of view, wider than the standard 20-60x Razor HD eyepiece has at 30x. The spotting scope eyepiece does more than convert your spotting scope from variable range to fixed range; it includes a ranging reticle with subtension lines for ranging, holdover, and windage, available in your choice of MOA or MRAD-oriented lines. High density, extra-low dispersion glass on the Vortex spotting scope accessory combines with anti-reflective XR lens coatings for high light transmission values, ideal for observation during twilight or dawn, when animals are most active. The Vortex Razor HD 30x Fixed Zoom Eye Piece also utilizes an ArmorTek lens coating to preserve the integrity of the lens; ArmorTek is scratch resistant and prevents oil and dirt from getting a foothold on your spotting scope's lens. Vortex Optics has built the eyepiece to be durable as well, with argon purging to eliminate interior fogging and O-ring sealing to make the eye piece waterproof. Observers of all types can use these Razor HD spotting scope accessories, which utilize twisting eyecups to expand or contract interpupillary distance, allowing glasses wearers to use the eyepiece just as well as someone without glasses. Convert your variable zoom Razor HD spotting scope to a high-resolution, highly accurate spotting scope with your choice of ranging reticle by using the Vortex RazorHD 30x Fully Multi-Coated Ranging Spotter Scope Eye Piece.