Baader item #2958214
With the addition of Baader's new Finetuning Rings, each Hyperion eyepiece can now function as four eyepieces! Available in 14mm and 28mm lengths. The finetuning rings are 2" OD and threaded M48 (filter thread) on each end, so they can be installed in-between the Hyperion's removable front negative element and main body. The added spacing decreases the focal lengths (increases magnification), according to the table below. Finetuning rings are made to match the Hyperion finish, and are fully internally sharp v-threaded and blackened to eliminate stray light reflections from the internal surfaces.
Also, 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 finetuning 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 use of 2" filters with Hyperions, something that is not possible with any other 1.25" eyepiece.
Please 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 note that the 24mm Hyperion is not able to make use of the Finetuning Rings, due to its different optical design.
| Hyperion EP | With 14mm Ring | With 28mm Ring | With 14 + 28mm Rings | With Baader 2" Filter |
| 21 mm | 17.6 | 15.5 | 14.0 | 18.5 |
| 17 mm | 13.1 | 10.8 | 9.2 | 14.6 |
| 13 mm | 10.8 | 9.2 | 8.1 | 11.7 |
| 8 mm | 6.0 | 5.0 | 4.3 | 6.9 |
| 5 mm | 4.0 | 3.2 | 2.6 | 4.3 |
| 3.5 mm | 2.5 | 2.1 | 1.8 | 2.9 |
The new 10mm Hyperion eyepiece will also benefit from the use of these rings. While there are no official numbers from Baader, we estimate that the 10mm will function approximately as a 7.9mm eyepiece with the 14mm ring, a 6.7mm eyepiece with the 28mm ring, and a 5.8mm eyepiece with the 14+28mm rings.
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