Inaddition to its obvious convenience, the Swarovski zoom is proof that there isno inherent reason for a zoom lense to provide inferior images. In fact, atmedium power, the Swarovski zoom is one of the finest eyepieces available. Atlow power it is the equal of most wide angle, long eye-relief eyepieces, and the brightness, contrast, and detail that it provides at even the highest power mustbe seen to be appreciated. This is an excellent eyepiece from Swarovski, not just an excellentzoom eyepiece. Eyepiece 20x-60x Zoom for ATS/STS65(HD) and ATS/STS 80(HD) Spotting Scopes, with lens cover. Watertight Swarovsky eyepiece with 20x to 60x zoom magnification. Bright and clear images right up to the periphery. Full field of view, even for spectacle wearers due to individually adjustable twist-in eye cups, removable for cleaning.