This Hyperion Zoom adapter from Baader is designed for M43 internal thread to SP54 external thread. It allows the connection of all standard camera lenses with filter thread to the Hyperion Zoom 8-24 mm Mark III (discontinued) and the Baader Hyperion Universal Zoom Mark IV, 8-24 mm eyepiece (1.25" / 2"), in order to use the eyepiece in conjunction with the camera lens as an "afocal projection system". The connection rings from this system are Hyperion DT-rings. All you need to do is get the matching SP54 adapter for your filter thread, and adapters are available for most filter thread sizes. It is NOT suitable for Morpheus 76-degree eyepieces. The Morpheus version is available as Baader Morpheus M43 / SP54.