This is a Spencer Microscope head with a machined a 2" adapter for it. Also includes two pairs of wide field microscope eyepieces. Purchased on astromart a while back to give binoviewing a try.
Now its time for someone else to give it a try. The unit works quite well on the Moon and Planets - a little dim on deepsky. Views are sharp and the eyepieces offer about a 55 deg field of view. Power will depend on your scope. I've used the unit in Refractors and Scts. The is an interpupilary adjustment and a diopter on the right eyepiece.
Selling for what I paid for it $95 shipped conusa. Money order or paypal (+3% to cover fees.
thanks for looking