The straight-through viewing Kowa TSN-99S 30-70x99 Prominar Spotting Scope Zoom Kit combines their largest scope body with a powerful wide-angle eyepiece and gives you a complete observation rig—you just need to supply a reliable and steady tripod to set it up on. This spotting scope utilizes a combination of extra-low dispersion and pure fluorite crystal glass, coupled with optical lens coatings, to produce views free from chromatic aberrations, high light transmission, and improved color rendition, resolution, contrast, and clarity. Additional design elements include a specially designed ring and bayonet mount that allows the use of a suite of accessories and eyepieces to enhance your user experience and expand the capabilities of your scope. Powerful 30-70x wide angle eyepiece allows you to scan the terrain for subjects on low power with the ability to zoom in and make detailed observation and positive identification Front XD lens is made of extra-low dispersion glass and the secondary is made of fluorite crystal glass creating an optical path free from chromatic aberrations at even high magnification with high contrast and crisp clarity Massive 99mm objective lens delivers outstanding low light performance with exceptional detail Anti-reflection fully multicoated lenses maximize light transmission and improve color rendition, resolution, contrast, and clarity Proprietary KR coating on the exterior of the lens actively repels dirt, moisture, and dust from collecting on its surface to ensure clear views 105-foot field of view on 30x, 60 feet on 70x