Baader Hyperion Finetuning Ring

Baader Hyperion Finetuning Ring

  (4 Reviews)
✓ 2 year warranty


2x in stock shipped 1-2 working days

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 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

Hyperion Focal Lengths with Finetuning Rings

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.


Customer reviews

Average Rating (4 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Wednesday, 11 November 2020  | 

Well made and nicely finished with matt black inside. best not to finger mark the inside.

Rating (max 5):  
Baader rings.
Thursday, 8 October 2020  | 

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.

Rating (max 5):  
Friday, 22 May 2020  | 

purchased these to move in internal ERF further forward into the draw tube. Good fit onto the diagonal filter thread.

Rating (max 5):  
Baader finetuning ring
Thursday, 7 March 2019  | 

Enables me to use a few Hyperions (I have for outreach) at different focal flawlessly .. highly recommended.


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