About this product
Model: BhyperionTuningRing-1
Part Number: 2958214
With the addition of Baader's new Finetuning Rings, each Hyperion eyepiece can 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, 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.
Hyperion Focal Lengths with Finetuning Rings
| Hyperion | w/ 14mm Ring | 28mm Ring | 14 + 28 Ring | w/ Baader 2" Filter |
| 21mm | 17.6 | 15.5 | 14.0 | 18.5 |
| 17mm | 13.1 | 10.8 | 9.2 | 14.6 |
| 13mm | 10.8 | 9.2 | 8.1 | 11.7 |
| 8mm | 6.0 | 5.0 | 4.3 | 6.9 |
| 5mm | 4.0 | 3.2 | 2.6 | 4.3 |
| 3.5mm | 2.5 | 2.1 | 1.8 | 2.9 |
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 the 24mm Hyperion is not able to make use of the Finetuning Rings.
Customer reviews
| Average Rating (4 Reviews): | |
11 November 2020 | Phillip
Well made and nicely finished with matt black inside. best not to finger mark the inside.
08 October 2020 | Tim
Used one of these to extend the nosepiece of my 2" -1.25" adaptor by 14mm so I don't hit my filters when I use the Barlow. Works great.
22 May 2020 | Stephen
purchased these to move in internal ERF further forward into the draw tube. Good fit onto the diagonal filter thread.
07 March 2019 | Joseph
Enables me to use a few Hyperions (I have for outreach) at different focal lengths..work flawlessly .. highly recommended.
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