Hyperion T-Adapter M43i / T-2a (M42x0.75) for connecting DSLR T-rings. The adapter features an M43 internal thread and adapts to a T-2 external thread. The length of the adapter is approximately 5 mm. The 1.25" Hyperion eyepieces and the 2" Hyperion Aspheric eyepieces have an M-43 thread on the eyepiece side. The Hyperion - T2 adapter fits this thread and adapts to a T2 external thread. This allows you to directly connect a DSLR camera to the eyepiece using T2 rings.