Alpine Astronomical Baader 72° Hyperion 31mm Aspheric Eyepiece (1.25"/2")

Alpine Astronomical Baader 72° Hyperion 31mm Aspheric Eyepiece (1.25"/2")

Alpine Astronomical Baader 72° Hyperion 31mm Aspheric Eyepiece (1.25"/2")

B&H # ALHYP31 MFR # HYP-31
Alpine Astronomical Baader 72 Hyperion 31mm Aspheric Eyepiece (1.25"/2")

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Product Highlights

  • 31mm Focal Length
  • 72° Field of View
  • 6-Element/4-Group Aspheric Lens Design
  • 1.25"/2" Diameter Barrel
  • Phantom Coating Group Multi-Coatings
  • 43mm and 54mm T-Ring Threads
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Focal Length: 31mm

31mm 36mm

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Alpine Astronomical HYP-31 overview

  • 1Description

With an exceptional field of view and long eye relief, the Alpine Astronomical Baader 72° Hyperion 31mm Aspheric Eyepiece produces relatively low magnifications on most telescopes, making it ideal for detailed lunar and planetary viewing or wide-field deep sky observations, plus astrophotography. Its 72° field of view offers a viewing angle that is wider than the human eye, but not so wide that contrast and image brightness are compromised.

The eyepiece lens is made with a unique 6-element/4-group aspheric configuration to virtually eliminate spherical aberration, astigmatism, "kidney beaning," and other optical distortions. Phantom Coating Group multi-coatings, blackened lens edges, and internal baffling deliver bright and high-contrast views that are free of scattered and diffracted light. It comes with two barrel sleeves that allow it to fit into 1.25" and 2" drawtubes and accessories. When using the 1.25" barrel, the field of view is reduced to 55 degrees. To limit distraction and improve brightness and contrast, a winged eyecup is included that can fold down for those who require eyeglasses during viewing. To perform all types of astrophotography, including afocal and projection, two sets of T-mount threads are provided—43mm and 54mm—that accept standard camera-specific T-rings to directly attach CCD imaging cameras or DSLRs.

In the Box
Alpine Astronomical Baader 72° Hyperion 31mm Aspheric Eyepiece (1.25"/2")
  • 2" Barrel Sleeve
  • 1.25" Barrel Sleeve
  • Dust Caps
  • Folding Eyecup
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Alpine Astronomical HYP-31 specs

    Focal Length 31 mm
    Barrel Diameter 1.25" / 2"
    Eye Relief 17 mm
    Field Stop Diameter 1.25": 30 mm
    2": 38 mm
    Apparent Field of View 72° using 2" barrel
    55° using 1.25" barrel
    Dimensions Length:
    Main body: 3.0" / 76.7 mm
    1.25" Barrel: 0.9" / 23.9 mm
    2" Barrel: 1.1" / 27.5 mm

    2.3" / 59.5 mm

    Weight 17.4 oz / 493.0 g

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