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).
Inserts in to 1.25 focusers Requires T-mount SLR adapter ( listed here as accessories ) Incorporates 2x magnification
Built-in barlow lens can be removed ( some telescopes will not focus properly without barlow )