• Front side - T2 (M42x0.75) female thread
• Rear side - M28x0.75 male thread
• Extra optical path - 7 mm
• Weight - 33 g

This adapter allows using binoviewer with M28x0.75 thread on a telescope with T2 port.

The adapter consists of aluminium body with M28x0.75 male thread to attach a binoviewer, and bronze T2 insert held by three thumb screws.

So, you can loose screws a bit and turn the body relatively to the insert to position you binoviewer correctly. No need to use thin spacers (O-rings) anymore.