If you have a Schmidt-Cassegrain binocular with a SLR or MILC camera, you still need this SC/T2 adapter (50 mm). Screwing it to the back of the scope, you get a T2 threaded surface on which you can screw the T2 adapter that depends on the camera.
The Celestron f6.3 focus refractor has an ideal sensor distance of 105 mm. The depth of field of the DSLR/MILC camera plus, the length of the T2 adapter (44+11 mm for Canon EOS, other manufacturers may have different ratios see. MILC machines) 55 mm plus the length of the SC/T2 adapter 50 mm together give the ideal distance of 105 mm.