Hyperion 2" Finetuning Stopring with brass clamping ring and 2 thumb screws.
Baaders Hyperion 2" Finetuning Stop Ring, with internal brass compression ring, is a highly recommended accessory for users of Baader Hyperion eyepieces.
It is used when combining a Hyperion Eyepiece and a 2" diagonal or prism and prevents the 1.25" eyepiece barrel from hitting and damaging the internal components, especially whenever additional Finetuning Rings (#2958214 or #2958228) are lengthening the original eyepiece body.
(See the PDF below for an example of use)
