Designed specifically for TSN-880 and TSN-770 series spotters,Kowa'sTSN-EX16 1.6x Eyepiece Extenderfits between the scope body and eyepiece to increase the magnification by a factor of 1.6x with virtually zero light loss. It installs quickly and easily without tools or permanent modification by simply unscrewing the scope ring from the body and threading the extender in its place. The bayonet mount accepts the eyepiece and a simple quick-release button allows the eyepiece to be quickly removed. A ring on the extender screws off for using digiscoping adapters. Made to match the color and form of the eyepiece, this extender blends seamlessly with the scope's aesthetics. Its compact form factor allows it to be used on straight and angled-viewing models and left installed when not in use.