Here what I used for the 2"eyepiece I adapted , and since i took these I have put a thread on the top of the barrel to make a better fit.
My d7 has a large lens with 49mm filter threads.
All I did was to buy a 49-52mm adapter $12.00 and machined the EP barrel so the thread adapter would press fit with some locktite . It cost $15 for the machining
You will notice that the camera strap is wraped around the scope >>>just in case.
The D7 is an Slr type but with out a removable lens. It give a FFOV at about 45mm on the camera lens and combined with the 42mm EP give just about a FOV of DSLR with out it lens.
There are how ever a bunch of lens in this set up.
Works a treat on wide field .
The bracket I made with a drill and hack saw and a few bit of aluminium bar and a hose clamp .
Cheap and simple >>just like me