This is a Bushnell Spacemaster Camera Adapter model #22-3025. It is like new with only the slightest wear on the anodizing of the threads.
One end screws into standard t-ring, the other screws onto the 1.25" visual back from celestron sct's and probably many more scopes with the same thread. Made to mate with Bushnell "spacemaster" spotting scopes.
Locks to any length. Markings on barrel correspond to f/l and f/ratio when using spacemaster spotting scopes and the available ep's.
$50 shipped conus
Paypal preferred, no fee