Celestron T Adapter/Barlow 1.25 Universal (Req. T-Ring) The Celestron Universal Barlow & T-Adapter is three accessories in one!;2X Barlow: Use during visual observing to double the magnification of every 1.25" eyepiece you own.;Prime Focus Photography: Use the T-Adapter portion of this accessory to transform your telescope into a giant telephoto lens.;Tele-Extended Photography: Use the T-Adapter with Barlow to get double the magnification of prime focus mode.;T-threads accept camera brand specific T-Ring (sold separately).