Use the Alpine Astronomical Baader Hyperion SP54/SP54 Extension Ring to add up to 11mm of optical length to your eyepiece for increased back focus during astrophotography. Consisting of three components, you get three extension rings that can be used individually to achieve the result you want, plus a cap for the exposed male M54 threads. The cap can be removed and the treads used to install the SP54/M28 or SP54/M37 Digital T-Rings (DT-Rings) for astrophotography with video cameras. This adapter is required to use the DT-rings with Hyperion eyepieces.
EAN: 4047825007360