Baader 36mm Hyperion Aspheric 2" Eyepiece

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Baader 36mm Hyperion Aspheric 2" Eyepiece

# 2454636

€ 205.00 Price excl. German VAT tax (19%): € 172.27

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  • Fixed focal length of 36mm Hyperion Aspheric 2" Eyepiece, 72° extreme widefield for large field of view
  • High quality Phantom Group Coating for maximum contrast
  • DSLR camera adaptable as projection eyepiece, with system thread SP 54

Product Questions and Answers

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Can this eyepiece be used in "eyepiece projection" configuration as telecompressor (speed booster)? I need to fit moon from my Celestron C11 on an APS-C sensor (~14mm diam Moon)
Question by: Andrei on Jun 2, 2020 3:53:00 PM | 1 Answer(s)

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Se puede ver las pléyades completas con este ocular?
Can you see the entire Pleiades with this eyepiece?
Question by: Reinaldo on Feb 2, 2023 5:12:00 AM | 1 Answer(s)

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In order to use this eyepiece for eyepiece projection with the Nikon Z6, what parts do I need beside the Nikon Z wide T-ring? Will there be any vignetting?
Question by: Jonathan on Feb 19, 2021 9:23:00 PM | 1 Answer(s)

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Baader 36mm Hyperion Aspheric 2" eyepiece being manufactured with the safety kurfs on the 2" barrel?
Question by: Davis Degarbo on Feb 16, 2023 6:47:00 PM | 1 Answer(s)

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Do you confirm the 72° apparent field of view with 31,75 mm connexion?
Question by: Eric MARIE on Mar 6, 2017 9:10:00 AM | 1 Answer(s)

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Is this eyepiece compatible with a Celestron C8HD? An astronomer told me that this piece may not be a good choice for the C8HD's internal corrector.
Question by: Christian on Apr 27, 2020 7:47:00 PM | 1 Answer(s)

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Is the 36mm eyepiece well corrected to F/5 refractors? I have a 8-24 zoom MarkIII, and it's way not. It is perfect in my F/9, but not in F/5. I read in a forum that Hyperions are designed to be corrected upto F/8. Is that true?
Question by: Ágoston Nagy on Feb 13, 2023 10:13:00 AM | 1 Answer(s)

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Can I use with Celestron 8 SC Edge HD ?
Question by: Luca on Feb 18, 2018 2:06:00 PM | 1 Answer(s)

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What is the Paracorr 2 setting for a Baader Aspheric 36mm?
Question by: Dale Martin on Dec 12, 2021 2:55:00 PM | 1 Answer(s)

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I have bought this eyepiece (2nd hand) and use it on 2 dobson 254/1200 and 355/1600, it produce coma at half of fieldview. Is this eyepiece design for such telescopes???
Question by: MELLAC Raphaël on Nov 1, 2019 12:14:00 PM | 1 Answer(s)

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Is there a small “mistake" with the drawing of the 31mm and 36mm Aspheric Hyperion EPs? Doc: G\Prosp\Baa\Zub\Okulare\Tabelle_Aspheric-Okulare

They show the reference surface (plane) or focal plane of the EP as being at different points within the same 31mm or 36mm Hypeion Aspheric EP, when it has the 2” adapter exchanged for a 1 1/4” adapter?

Since I have the lens and know that the 1 1/4” adapter contains no additional optics, I think it’s unlikely that this can vary with the same EP (with the same P/N) in the box zB both focal points (focal references) cannot be for the same EP.

I have seven Hyperion EPs and have just added another one - the 36mm Aspheric EP. I suspect I will eventually "succumb" and buy the 31mm as well! One thing about all Baader-Planetarium products is the very detailed descriptions and especially the Q&A provided which greatly helps with pre-sales inquiries.

Question by: Simon Miller on Jan 30, 2020 12:59:00 AM | 1 Answer(s)

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Is this eyepiece compatible with a F=1000mm, D=200mm telescope?
Thanks in advance for the answer
Question by: Arnaud Haemmerle on Dec 30, 2016 10:14:00 AM | 1 Answer(s)

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Does the Hyperion 36mm match with a Giant-Binocular (Vixen BT-126SS-A) ? does it reach focus ? many thanks in advance !
Question by: Alfredo Suatoni on Jan 29, 2018 12:24:00 AM | 1 Answer(s)

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Aspherical Eyepiece with 31mm and 36mm focal length (with Phantom Coating® Group)

Aspherical Eyepiece:

Normally, near-the-edge, rays are refracted towards the center when passing a lens, as near-axis light beams. Therefore, the image field in an uncorrected system can become blurred to the edge. The aspherical correction of an optical system, as with these eyepieces, now resolves numerous imaging errors at once. The sharpness is achieved over the entire image field, the distortion is reduced to a minimum and the eyepiece can be made much smaller and lighter.

The eyepieces are each delivered with 1¼ "and 2" plug-in sleeves

Application of Baader 2" Aspheric eyepieces

Asphercial Eyepiece
Aspherical Nexstar

Aspheric 2" eyepieces are launched against the world's most powerful large-field eyepieces and offer compelling advantages: higher star-limit size, unsurpassed color accuracy, low weight and an attractive price.

The aspheric eyepiece design includes aspheric lens surfaces as they are now the standard in the most modern camera lenses to offer the best image performance over the entire image field. The Aspheric eyepiece construction allows for fewer glass surfaces and in combination with the extreme quality of the Phantom Group multi-device. An Aspheric eyepiece delivers a brighter, more contrast-rich image than even expensive expensive wide-angle eyepieces with spherical lenses.

The Aspheric face is 72 degrees only minimally larger than the largest viewing angle of the human eye (68 degrees). In this way, the entire star field can be surveyed at once without having to "roll" with the eyes. Many wide-angle eyepieces offer an impressive 80-degree field of vision and more, but they can not be overlooked at all and the available light is distributed over an area of too large, so that the image brightness (= star limit) and contrast are given away.

The larger the image angle of a wide-angle eyepiece is constructed, the more difficult it becomes for the ocular designer to produce a good insight.

Extreme wide-angle eyepieces, but also wide-angle eyepieces with simple lens construction, often have a very "nervous" insight. If the eye is moved back and forth only slightly, the image field has disappeared immediately. A nervous eyepiece is a frustrating experience, especially for working with students, guests or at the people's day, because the observer obtain a good obervation.

In a direct comparison, all observers find that an Aspheric eyepiece exhibits finer stars and weaker structures in gas nebulies than much more expensive 2" wide angle eyepieces. Technological progress is particularly dramatic here.

Photographic adapter threads for all types of projection photography:

Photographic adapter threads for all types of projection photography
Photographic adapter threads for all types of projection photography

Photographically, all conventional DSLR camera housings can be attached directly behind the eyepiece using the eye-side M43 or the SP 54 system lens. A huge selection of adapter threads and transition rings are available. Thus, the telescopic focal length can be changed almost arbitrarily if small star fields or planetary objects are to be documented with high resolution. A detailed guide is included with each eyepiece.

System suitability for projection photography:

Photographic adapter threads for all types of projection photography
Afocal Projection Photography with Baader Aspheric Eyepieces

Each Aspheric eyepiece is equipped with screw threads on both sides in order to be able to install it as a projection system in an optical beam path.

On the telescope side there is a 2" SC thread in the eyepiece body which allows the eyepieces to be screwed firmly to the end of the tube of all Schmidt Cassegrain optics without a plug-in sleeve and without a zenith mirror.

Visually, this extremely short attachment allows for a larger true field of view than any wide-angle eyepiece with 2" plug-in sleeve.

Two-eyed stereoscopic observation with Aspheric eyepieces:

Stereoscopic observation with Aspheric eyepieces
Stereoscopic observation with Aspheric eyepieces

Aspheric eyepieces are the only long-focal wide-angle 2" eyepieces that can also be attached to astro-binoculars on both sides of the eyepiece. The Aspheric Eyepiece can be placed in any telescopic binocular, with the minimum eye distance not less than 56mm.

Baader Phantom Coating® Group

Baader Phantom Group Coating is a 7-ply broadband reflective coating with extremely low residual reflection. The term "group" indicates that the most effective anti-reflective layer system has been calculated for each individual glass group of the lenses used in the Hyperion eyepieces.

All these different anti-reflective layers on each individual glass surface have been optimized so that they are most effective where the human eye has its highest after-sensitivity - at approx. 520 nm - in the green area of the spectrum.

The best anti-reflective coating appears almost colourless: this proves that the anti-reflective coating is equally effective over the entire visible spectrum. Phantom Group anti-reflection coatings are almost completely colorless, depending on the type of glass. In this way it is ensured that the least light is lost for the night-adapted eye and that no stray light can occur.

If a tempered lens (eyepiece or lens) shows a strong green reflex when viewed from the front, this is not a Baader Phantom Group anti-reflection coating! The intense green reflex is a sign of a low-cost coating technique and means that most of the light is reflected in the spectral range between 500-550 nm, that is, lost.


Furhter information, image results...

Baader Blogpost:
The eyepiece series from Baader Planetarium

Baader Blogpost:
The camera at the eyepiece

Baader Blogpost:
Barlow lenses, their magnification factors and working distances

Related Articles

Additional Information

Manufacturer Baader Planetarium
SKU (#) 2454636
EAN Code 4047825011398
Net weight (kg) 0.43
Eyepiece Series Hyperion
Focal Length 36 mm
Apparent Field of View 72°
Eye Relief (mm) 19 mm
AR-Coating Phantom Coating® Group
Parfocal Eyepieces Yes
Barrel Size (in) 1¼", 2"
Optical Design Aspheric
Speciality Eyepiece projection: classical
Eyepiece Design
Field Stop Diameter 45 mm (2"), 30mm (1¼")
Field Stop Displacement to reference plane +/- 0 mm
Number of Lens Elements 6
Number of Groups 4
Slip Protect Safety Classic Undercut
Eyepiece Body above Reference Plane (mm) 84,7 mm
Length of 1¼" barrel (mm) 23,9 mm
Length of 2" barrel (mm) 27,5 mm
Outer Diameter 59,5 mm
Camera Thread M43, SP54
Threaded for filters Yes
Included Items
Dustcaps 1¼" dustcap (31,8mm), 2" dustcap (45mm), 2" dustcap (46.5mm - fits over eyecup)
Eyecups folding eyecup (M43)

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3 Item(s)

Miki B. 348/12/2022 15/12/202205:58
  • Rating:
Baader 36mm Hyperion
This is a really nice eyepiece. I did a lot of testing of the true field of view on various telescopes and it truly is 72 degrees when used as a 2 inch eyepiece.

With my super fast f6.5 refractor this eyepiece gives me astonishing 3.9 degrees of the field of view - comparable to some finder scopes. The Pleiades look absolutely spectacular through this combo.

Baader 36 mm shows even more value on slower, catadioptric scopes. With my 8 inch SCT this eyepiece allows more than generous 1.3 degree field of view, amazing for a two meter focal length telescope. Allows me to see M42 in all its beauty, M45 shows almost all stars while M81 and M82 fit really nicely in this wide field of view.

I also tested the flatness of the field of view and it seems to approach 100%. Would need a perfectly flat primary to confirm 100%, but at the end this is more than enough to show all stars in focus.

Here I am attaching a photo with Celestron’s entry level Omni 102 mm and Baader 36mm eyepiece. This combinations provides such wide field of view that a finder scope is not needed.

  • 1) Good quality
    2) Extra wide field of view at 2 inches
    3) Beautiful design with the red ring
    4) Lot of extra accessories included
  • Not a budget eyepiece
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Röhr 253/09/2022 11/09/202221:05
  • Rating:
36mm Hyperion Aspheric 2" Okular
Das Okular ist von Super Qualität, großes Sehfeld und gestochen klares Bild.
  • Sehr gut
  • alles gefällt mir und es gibt nichts negatives zu berichten
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wallnerr 06/01/2020 07/01/202014:49
  • Rating:
Hyperion 36mm am TEC 1120/160FL
Die Kombination des TEC1120/160 FL mit dem Hyperion 36mm ist einfach super. Das Bildfeld ergibt den kompletten M42 Orionnebel, die kompletten M45 Plejaden und zb komplett NGC 869_884 H&Chi.
Das war meine Forderung an das Okular in Kombination mit dem TEC.
Die Abbildung ist knackig scharf und sehr klar bzw. hell. Meinem Gefühl nach sogar noch über dem TeleVue Nagler 26mm. Mir als Brillenträger kommt dieses Okular extrem entgegen.
Von mir eine klare Empfehlung für dieses Okular.
  • Preis Leistung ist total korrekt.
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