Converts 2" female into 2" male thread Internal M48 Filter thread for 2" filter Can be used to connect Baader Hyperion Mark III Zoom directly to a Baader Star Diagnol gaining adfitional backfocus by swapping ClickLock-clamp for this adaptor.
Holds all all Zeiss devices - with 68mm thread (with 19mm optical height) Keeps all Vixen Optics - with 60mm thread on the focus tube (with 24mm optical height) Keeps all Astrophysics refractors with 2.7 "thread (with 13mm optical height)