Astro-Physics Baader Planetarium Heavy Duty T-2 Quick Changer (Bayonet)
This is a two function quick release Zeiss micro-bayonet for the Mark V Binoviewer also sold by Astro Physics. On one side is a Female Dovetail Bayonet, on the other is a 42mm Female thread for 42mm male accessories. It's two functions are simple; It not only allows the Mark V Binoviewer to be quickly released from the diagonal or other accessory, it also allows you to quickly rotate the Binoviewer for a more comfortable viewing position easily!
Manufacturer Product Number: BP6A