Camera adaptor T2 ring for Canon EOS with limited optical length

This accessory allows you to adapt the camera bayonet of a SLR camera to a T2 thread (M42x0.75). There are several possibilities for connecting the camera to the telescope with a T2 ring - the usual method is to use a 2" barrel with a T2 thread.

This T2 has an especially low optical length. This makes sense when the camera sensor cannot achieve focus with normal optical lengths of around 10mm.