This full frame field flattener is made for the SVX125D using the Stellarvue FSV-3B 3" focuser. Merely unthread the 2" adapter and thread this flattener into the female thread side of the adapter.
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. So this flattener as it comes will work with a DSLR with a 48 mm t-ring. It will also work with a ccd camera that uses the M48 thread and has a 55 mm back focus. If your ccd camera uses another thread and/or if the back focus is not exactly 55 mm, please call us and we can provide you with a modified version of this flattener with the proper adapter to meet your requirements.
If you want to use this flattener for our former 125 Access you will need to add a 2.5" focuser adapter.