Developed specifically for the latest generation Vortex Razor HD 27-60x85 spotting scope, the Razor HD MRAD Ranging Eyepiece is perfect for calling shots or spotter/shooter communication. The field of view is 130.3 feet at 1000 yards with 31mm of eye relief. The ranging reticle is Vortex's Razor HD 22x MRAD with subtension lines for both elevation and windage. This eyepiece is specifically designed for use with the latest generation Vortex 27-60x85mm Razor HD spotting scopes - it is not compatible with the 65mm and 50 mm Razor HD models. Vortex Razor HD Ranging Eyepiece MRAD RS-85REM