The Sirius Variable T-adapter is an excellent accessory for SLR cameras. Attach it to the rear cell threads of a Schmidt-Cassegrain telescope for prime focus imaging. This arrangement is used for terrestrial photography and short exposure lunar and planetary photography.
The T-Adapter can also be used for long exposure deep-sky photography. Both a T-adapter and T-ring are required to mount an SLR camera to your telescope.
Variable Back Focus.
Includes 15mm and 30mm Spacers.