Baader Fine Tuning Ring - 14mm
Baader 14mm Hyperion Eyepiece Fine Tuning Ring
Another novel way to change eyepiece focal length is to use a Baader 2" Filter in between the Hyperion negative element and main body, just like a small Fine Tuning Ring. The 8.5mm thickness of the filter cell will have a similar (milder) effect in reducing the Hyperion's focal length. This also allows the use of 2" filters with Hyperions, something that is not possible with any other 1.25" eyepiece.
Customer 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 24mm Hyperion Eyepiece is not able to make use of the Fine Tuning Rings, due to the difference in its optical design.
Baader Planetarium Product Number: HDFT-14
Questions & AnswersAsk a Question
Does this also work with the 31 mm aspherical Baader Hyperion?
Unfortunately, no. This ring only works with the 3.5mm to 21mm standard Hyperion eyepieces. The 24mm and the 31 and 36mm Aspheric do not have the same optical design where the spacer can be mounted ahead of the last couple lenses in the barrel.