Baader Planetarium Hyperion-Aspheric Mod

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Item #AAS024-2

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  • $219.00
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  • Hyperion-Aspheric design eliminates eyepiece aberrations
  • 2 inch and 1.25 inch eyepiece barrels included
  • Extremely bright and high contrast views
  • Great eye relief—comfortable view for eye-glass wearers
  • Superb for projection imaging; threads directly onto rear cell of SCT
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  • Description

    The Baader Planetarium 31mm and 36mm Hyperion Aspheric modular eyepieces are the world’s first astronomical eyepieces to use aspheric surfaces.  This new technology eliminates eyepiece aberrations without the usual penalty of extra lens elements, excessive size and weight, or high cost.  

    Two barrel sizes are included with these innovative eyepieces, allowing you the flexibility of using them in both 1.25 inch and 2 inch focusers.  The standard 2” barrel displays the full 72 degree field of view, and the special wide-field 1.25 inch barrel provides the maximum true field ever in a 1.25 inch format, with a field stop size of 32mm!

    Long eye relief for extreme comfort while viewing

    The Baader Hyperion Aspheric eyepiece offers freedom from blackouts, kidney beaning, and lack of distortion.   The design also provides long eye relief, and produces a view that is uncommonly comfortable and natural for all users—even eyeglass wears and those who like to use devices that correct for astigmatism.

    72 degree flat field of view

    The ultra-wide 72° field of both the 31mm and the 36mm Hyperion-Aspheric is extremely flat and distortionless.  It is virtually free of angular magnification distortion, providing you with unparalleled views of the Universe.  Phantom Group Multi-Coatings are applied to the optics to increase transmission and contrast, and thorough internal baffling keeps light from scattering.

     Baader Hyperion-Aspheric eyepieces are perfect for projection imaging

    The Hyperion-Aspherics 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 inch x 24 tpi SCT threads on the eyepiece body allows either the 31mm Hyperion-Aspheric or the 36mm Hyperion-Aspheric to be threaded directly onto the rear cell of popular Schmidt-Cassegrain telescopes.  This results in the highest rigidity possible for imaging, and makes for one of the most flexible eyepieces on the market today.


    Supplier SKU


    Shipping Restrictions

    Available for shipment to the USA and Canada only.

  • Dimensions & Specifications

    Eyepiece Type:


    Barrel Size:

    2" and 1.25"

    Number of Lens Elements:


    Number of Groups:


    Apparent Field of View:

    70 degrees



    Eye Relief for 31mm:


    Eye Relief for 36mm:


    Field Stop for 31mm with 2" barrel:


    Field Stop for 31mm with 1.25" barrel:


    Field Stop for 36mm with 2" barrel:


    Field Stop for 36mm with 1.25" barrel:


    Weight of 31mm:

    13.8 ounces

    Weight of 36mm:

    14.7 ounces

  • Product Guarantee

    We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.

    Manufacturer Warranty

    This product has a 2 year manufacturer's warranty against defects is provided. If you have specific questions about this product's warranty please contact Alpine Astronomical's Customer Service department by email at

    Return & Exchange Policy

    At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.

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