Alpine Astronomical Baader Hyperion SP54/SP54 Extension Ring

This extension ring is used to add 11mm of optical length to the Hyperion M54 thread. It allows for the attachment of M28/M37 DT-Rings. The package includes three extension rings and a cap for the male M54 threads. The cap can be removed to use the threads for installing SP54/M28 or SP54/M37 Digital T-Rings. This adapter is necessary for using the DT-rings with Hyperion eyepieces.