Celestron 48 mm T-Adapter For EdgeHD 9.25", 11", and 14" - 93622Celestron 48 mm T Adapter For EdgeHD 9. 25", 11", and 14" Celestron 48 mm T Adapter Attaches directly to the rear cell of the larger Edge optical tubes Produces better illumination for today's larger full frame imaging sensors, all the way to the corners Reduces vignettingdarkening around the edges of the image sensorby providing unobstructed light to the camera Best Used on the EdgeHD 9. 25", 11", and 14" systems This item is a Celestron 48 mm T