Change the 20-60x zoom eyepiece that comes standard with their premier spotting scope for this fixed-magnification Burris optics signature HD 30x wide angle eyepiece and get the added benefit of a mil-based reticle to help calculate hold-over. and to estimate the range to, and size of, your target. The uncluttered reticle features simple indicators and stadia set at regular intervals to allow you to make your impact-point corrections without having to touch the turret settings, and to gauge whether you can or should take the shot at all. Engineered to the same standards as the spotter, the eyepiece has a proprietary bayonet-style mount to enable quick and easy changes, as well as the low-dispersion glass and index-matched optical coatings so views through the eyepiece are contrast-rich, with accurate color representation, without distortion across the entire wide 64 degree field of view. Argon gas-filled and O-rings seal the optical system to make it waterproof and fogproof in all conditions. Features: - 30x fixed magnification - SCR mil-based ranging reticle - high density low dispersion glass - fully multi-coated optics - wide 64 degree apparent angle of view - long 18mm eye relief - nitrogen-filled, water and fogproof - twist-up rubber eyecup - easy bayonet mounting. Specifications: - magnification: 30x - reticle: SCR ranging reticle, MIL - field of view: 112.0' at 1000 Yd/37.3 M At1000 M- exit Pupil: 2.8 mm - eye relief: 18 mm - mount: proprietary bayonet mount - weatherproofing: argon-filled, water and fogproof - length: 2.1 inch - weight: 5.0 oz..