The Digadapt adapter looks much like a conventional variable projection adapter. The critical differences are that it is larger so that it can hold larger eyepieces and it is designed to collapse much smaller so you can still get close coupling of the lens to the camera. It allows the use of suitable lenses which are not Digi-T compatible such as eyepieces that don't have rubber eyeguards. This adapter is "T" threaded so you will need the correct components to couple it to your camera. It is compatible with the Digi-T system parts. If the eyepiece can fit through the T-Thread it can couple as closely as the Digi-T. Not recommended for Newtonians or Refractors where back focus could be an issue (the eyepiece is raised up in the holder and some scopes with limited focus range may not be able to reach focus with the adapter in place).