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This is a used but unmarked 14mm tuning ring for Baader Hyperion eyepieces in excellent condition, and very little signs of use. Not for use with the 24mm Hyperion. No box.
The Baader 14 mm Hyperion Fine Tuning Ring will allow you to easily change the focal length of your Hyperion eyepiece! Simply install it between the front element and the main body of the eyepiece. The Baader 14 mm Hyperion Fine Tuning Ring is made to match the Hyperion finish, and is fully sharp v-threaded and blackened internally to eliminate stray light reflections from the internal surfaces.
With the addition of Baader's Fine Tuning Rings, your Hyperion eyepiece can now function as not one, but four eyepieces by using both the Baader 28 mm Fine Tuning Ring and the 14 mm ring. Both the 14 mm Fine Tuning Ring and the 28 mm Fine Tuning Ring have an outside diameter (OD) of 2" and are threaded with an M48 (filter thread) on each end, so they can be installed in between the removable front negative element and the main body of the Hyperion eyepiece. The added spacing decreases the focal lengths (or increases magnification).
Note: Removal and installation of the front negative element should be done in a clean environment to prevent dust or other contamination from depositing on the internal elements, which are very difficult to clean. Also, please be aware that the Baader 24 mm Hyperion Eyepiece is not able to make use of the Fine Tuning Rings, due to the difference in its optical design.