Tele Vue Twist-On Style Eyeguard 8mm Extender

The Tele Vue Twist-On Style Eyeguard Extender raises the eyeguard position by 8mm and includes a rubber eyeguard and eyepiece cap. Units are stackable: for example 2 units add 16mm height and make a 40mm Pl"ssl very comfortable for solar viewing by blocking out stray daylight to maximize contrast in white light or hydrogen-alpha viewing. Eyeguard extender is black anodized aluminum with anti-reflection threads. The Eyeguard Extender attaches to the top of your eyepiece with the simplicity of a DIOPTRX corrector. It has two rings that thread together to clamp on the eyepiece: an inner-ring that holds the rubber eyeguard and outer ring that slips over the top of the eyepiece. Starting with the inner-ring backed off from fully tight, take off your existing rubber eyeguard, place the Eyeguard Extender in its place, screw-down the inner ring until the Eyeguard does not slip off.