Universal 1.25" T-Adapter fits on any of telescope that uses 1.25" eyepiece focuser but in addition includes an integral 2x ACHROMATIC DOUBLET LENS (Multi Coated). This lens enables you to use your STARTRACKER SYSTEM reflecting or refracting telescope to photograph at 2x i.e. if you are using a D=100mm / F=1000mm telescope, it converts it into a 2000mm Telephotography. The 2x Tele-negative Achromat features T-Thread for direct camera attachment. Can be use as a standard 2X Achromatic Barlow lens 1.25"OD for visual application at a normal cost of Rs 150.00/-