T-Adapter/Barlow Lens Universal - 1.25"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