This is a very low profile 2" field rotator which enables camera rotation to occur electronically. This consequently allows for one to automate various tasks such as target framing and orientation as well as guide star acquisition with an off axis guide camera. It has a 2" barrel on the telescope side and a male T thread on the camera side. More information is available
here.
Looking to get $650 shipped anywhere in Australia. Comes with the rotator as well as the original dust caps for both ends and the AC power adapter.