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Side profile of the Orion 20 mm Sirius Plossl eyepiece stood upright.
  • Side profile of the Orion 20 mm Sirius Plossl eyepiece stood upright.
  • Angled side profile of an Orion 20 mm Sirius Plossl eyepiece, showing the top of the eyepiece.
  • Angled side profile of an Orion 20 mm Sirius Plossl eyepiece on its side, showing the threaded barrel.
  • Angled side profile of an Orion 20 mm Sirius Plossl eyepiece on its side with the top of the eyepiece faced towards the lower right.
  • Close up of an Orion Sirius Plossl eyepiece filter.
20 mm Sirius Plossl 1.25" Eyepiece

20 mm Sirius Plossl 1.25" Eyepiece

$34.95

Exp Delivery : Thu, 12 Nov

Free shipping on orders to the contiguous U.S.

In Stock

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Product Details

Since 1975

Free Shipping Site-Wide

2-Year Warranty


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Description

Optimize your deep-sky and wide-field telescope viewing with this 20 mm Sirius Plossl eyepiece designed for 1.25″ focusers. A classic 4-element Plossl optical system delivers bright, sharp views with excellent contrast, making it ideal for scanning open star clusters, nebulae, and larger galaxies with reflector, refractor, or catadioptric telescopes. Multi-coated lenses enhance light transmission, while the durable aluminum body and comfortable rubber eyeguard ensure reliable performance night after night. A wide 52° apparent field of view enriches your observing experience.

Product Specifications

  • Focal Length: 20 mm
  • Eye Relief: 20 mm
  • Optical Elements: 4
  • Optical Design: Plössl
  • Filter Threads: Yes (1.25″)
  • Coatings: Multi-coated

Product Features

  • Multi-coated optics improve light transmission and contrast
  • Blackened lens edges reduce stray light and enhances image contrast
  • Great for viewing open star clusters, nebulae, and larger galaxies

  • Filter threads accept standard 1.25″ astronomical filters
  • The durable aluminum housing is a robust build suitable for many telescope types
  • Rubber eyeguard helps block stray light and position your eye comfortably at the correct height.

Product Manual

Orion Sirius Eyepiece Manual (85.45 kB)

What’s Included

  • 20 mm Sirius Plossl Eyepiece
  • 2x Dust Covers

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