This extension ring has an optical path length of 11 mm with a threaded protective flap for the SP54 external thread. It is required for the connection of the DT-rings SP54 / M28 and SP54 / M37. These Hyperion DT-rings have the shortest distance between eyepiece lens and digital camera lens. There are 2 adjusting rings for SP54 thread that are included with the purchase of each Hyperion DT-ring.
- Optical Length: 11 mm
- Inner Diameter / Clear Aperture: 50 mm
- Outer Diameter: 57 mm
- Outer Connection (Lens Sided): Thread, SP54
- Inner Connection (Eyepiece / Camera-Sided): Thread, SP54