This is a rotating field flattener for the Stellarvue SVX102T and the SVX102T-R. This flattener is formatted for this telescope specially and it threads into the adapter on the focuser draw tube.
This flattener will also work with former model 102 mm Stellarvue telescopes that have either a Feather Touch or Stellarvue 2.5" focuser but you need to add this adapter in order to thread it to your focuser drawtube.
If your 102 mm telescope has a 3" Feather Touch focuser you will need this adapter to thread it to the focuser.
If your 102 mm telescope has a 2" focuser, this flattener will not attach to it.
On the camera side of this flattener is a standard M48X.75 thread. The back focus from the base of this thread is 55 mm. This means that the sensor in the camera must be 55 mm from the flattener. So this flattener as it comes will work with a DSLR with a 48 mm t-ring since a DSLR and t-ring places the sensor in the camera 55 mm inside the camera. The flattener/rotator will also work with a ccd camera that uses the M48 thread and has the sensor 55 mm from this thread. If your ccd camera uses another thread and/or if the sensor is not exactly 55 mm from the attachment thread, please call us and we can provide you with a modified version of this flattener with the proper adapters to meet your requirements.