Mount your cameras or other devices to any Edge HD Schmidt-Cassegrain telescope (SCT) using the Baader Ultrashort SCT T-Adapter from Alpine Astronomical. This ultrashort (0.28" / 7mm optical path) knurled adapter ring features one 2"-diameter female thread with a 1/24" pitch for mating with your telescope's output and a standard T-2 male (M42 x 0.75) thread for connecting your viewing or photo equipment.