Baader 31mm Hyperion Aspheric Eyepiece - 1.25"/ 2"

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Baader 31mm Hyperion Aspheric Eyepiece - 1.25"/ 2"
Item # BA-HYP-31
  • The aspheric surfaces on the 31mm Baader Hyperion Aspheric Eyepiece eliminates distortion without extra elements, weight, or price.
  • Supplied with a 2" barrel and 1.25" barrel.
  • The 31mm Baader Hyperion Aspheric Eyepiece threads onto the back of most SCT rear cells, producing a rigid connection for imaging.
  • A wide 72 field of view and excellent eye relief are hallmarks of this great eyepiece!


Baader 31mm Hyperion Aspheric Telescope Eyepiece

Baader has evolved the wide field astronomical eyepiece to a new level with the introduction of the Hyperion Aspherics. The 31mm Baader Hyperion Aspheric 72º Modular Eyepiece is one of the world's first to incorporate aspheric surfaces! This new technology has allowed Baader to eliminate eyepiece aberrations without the usual penalty of extra lens elements, excessive size and weight, or higher

The Baader Hyperion-Aspherics are great for projection imaging, and are threaded to accept the full line of Hyperion Digital T-Rings for a robust direct attachment of almost any camera. The clever use of 2"x24tpi SCT threads for attaching the 2" barrel permits the Hyperion-Aspherics to directly thread onto the rear cell of popular SCTs. This results in the highest rigidity possible for imaging. Two barrel sizes are provided with each Hyperion Aspheric. The standard 2” barrel provides the full 72º field of view, and a special wide field 1-1/4" barrel provides the maximum true field ever in this barrel size, with a field stop of 1.265”(32mm)! - perfect for extracting every bit of field possible in 1.25" focusers or binoviewers.

Baader Planetarium 31mm Hyperion Aspheric Telescope Eyepiece Features...

  • The Baader Hyperion Aspheric eyepieces offer freedom from blackouts, kidney beaning, and lack of distortion, and combine with long eye relief to produce a view that is uncommonly comfortable and natural for all users. Even eyeglass wearers and users of popular astigmatism correcting lenses will enjoy the comfort level of the Baader Hyperion Aspherics!

  • The ultra-wide 72º field of view of these eyepieces are extremely flat and without distortion, and are virtually free of angular magnification distortion.

  • Baader’s renowned Phantom Group Multi-Coatings and thorough internal baffling produce an extremely bright and high contrast view that is free of scatter.

  • The Hyperion Aspheric eyepieces accept Televue's Dioptrx astigmatism correcting lenses.

  • The 31mm Baader Hyperion Aspheric weighs 13.8 ounces or 39 grams.
Baader Planetarium Product Number: HYP-31
Additional Information

Additional Information

Manufacturer Baader
Optical Design Hyperion Aspheric
Barrel Size 1.25"/2"
Warranty 1 Year Warranty
Eyepiece Field of View - Apparent 72º
Eyepiece Focal Length 31mm
Eyepiece Eye Relief 18mm
Eyepiece Manufacturer Series Baader Hyperion Aspheric
Eyepiece Weight 13.8 oz.
Field Stop 32mm
Number of Lens Elements & Groups Not supplied by manufacturer
Comes with Dust Caps? Yes
Comes with Eye Guard? Yes

Customer Reviews 3 item(s)

Wow - clear and bright and sharp
I bought this eyepiece after getting a recommendation on an astronomy forum. The recommendation was to buy a Hyperion rather than a Nagler. The aspheric design reduces light loss through multiple lens elements and yields a beautiful view.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Jim / (Posted on 7/20/2015)
Smacks of Quality
This is a fantastic eyepiece that delivers pin point stars with great contrast across its wide field. Only at the extreme edge were there any indications of coma. I am very pleased with this purchase and at its price I do not think it can be beat. Anyone looking for a top quality wide-field 2 eyepiece this is it.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Jon / (Posted on 9/27/2010)
Low Power Workhorse
This eyepiece has replaced the 32mm TV Plossl that used to be my main low power eyepiece. On-axis transmission and contrast are actually a touch better than the Televue product, and the field is significantly wider even when used in the 1.25 focuser. Astigmatism is very low, field curvature is visible but minor, and angular magnification distortion is almost nil. It's a pleasure to use, easy on both the eyes and the focuser drawtube, and the price is right.

For me, it's a keeper.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by llanitedave / (Posted on 7/8/2008)
Included Items

Included Items

  • Baader 31mm Hyperion Aspheric Eyepiece
Questions & Answers

Product Questions

What adaptor would be needed to attach my DSLR to this eyepiece?
What is the maximum AFOV with the 1.25-inch barrel?
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