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Baader Hyperion Finetuning-Ring M48, 28 mm

$21.00
SKU HDFT-28 (Baader #2958228)

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Description

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 1¼" 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 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
10mm 8.4 7.1 6.1 9.1
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


14mm and 28mm Finetuning Rings

 

Installation of Finetuning Ring

 

Finetuning Ring Installed

Specifications
MANUFACTURER Baader Planetarium
SKU (#) 2958228
EAN CODE 4047825007261
WEIGHT (NETTO) 0.052
OPTICAL LENGTH (MM) 28
INNER DIAMETER / CLEAR APERTURE (MM) 45
OUTER DIAMETER 2" (50,8mm)
INNER CONNECTION (LENS SIDED) Thread, M48
OUTER CONNECTION (LENS SIDED) Barrel, 2" (50,8mm)
INNER CONNECTION (EYEPIECE/-CAMERA-SIDED) Barrel, 2" (50,8mm)
OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED) Thread, M48
ADAPTABLE TO Not suitable for Morpheus® 76° eyepieces
COMPATIBLE BRANDS Baader Planetarium
TYPE OF ADAPTER Extension
Downloads

Hyperion eyepieces application examples

Important Note: Proper opening of Hyperion eyepieces for focal length extension