Celestron 48mm T-Adapter for 9.25", 11" and 14" EdgeHD Optical TubesThe 48 mm T Adapter is the accessory of choice if youd like to attach your full frame DSLR or astronomical camera to a Celestron EdgeHD optical tube. With DSLR CCD chips getting larger, Celestron created the 48 mm T Adapter to reduce vignetting and provide a larger light path to your cameras sensor, producing exceptional astrophotos. Blocks Sensor's Corners The standard T Adapter for EdgeHD 9,25", 11", and 14" comes with a 42 mm T Thread for a 42 mm T