Orion

Orion 20mm Sirius, 1.25" Plossl Eyepiece with 52 Degree Field of View.

SKU: ONSP20 MFR: 08733
Due to Manufacturer Restrictions, This Item can NOT be Shipped to California.
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About the Orion 20mm Sirius

The Orion 20mm Sirius Plossl Eyepiece offeres a wide 52° apparent field of view which provides extremely sharp images of impressively high contrast. It's ideal for all types of telescopes: reflector, refractor and catadioptric. The Plossl 4-element design is renowned for its outstanding performance and has become the standard by which all other eyepieces are judged. The Sirius Plossl optical system is fully coated with magnesium fluoride on every air-to-glass surface. Lens edges are blackened to reduce scattering of stray light and maximize contrast.

The lenses are mounted in black-anodized aluminum housings with a 1.25"-diameter chrome-plated brass barrel for durability and precision fit. The barrel is internally threaded to accept standard filters. The built-in rubber eyeguard enhances viewing by helping to block out ambient light and position the eye. This 20mm eyepiece excels for moderately low power scanning of open star clusters and viewing of extended nebulas and larger galaxies.

Orion 20mm Sirius Features

  • This 20mm eyepiece is ideal for all types of telescopes: reflector, refractor and catadioptric
  • Offers a 52 degree apparent field of view for clear, sharp images of impressively high contrast
  • Fully coated with magnesium fluoride on every air-to-glass surface
  • Excels for low power scanning of open star clusters and viewing of nebulas and larger galaxies

Orion 20mm Sirius Specifications

Design Plossl
Eyepiece focal length 20.0mm
Barrel size 1.25"
Apparent field of view 52.0-deg
Eye relief 13.0mm
Coatings Multi-coated
Number of elements 4
Filter threads Yes
Parfocal No
Field stop diameter 17.1mm
Barrel security recess No
Blackened lens edges Yes
Rubber eyeguards Yes
Body material Aluminum
Dimensions 2.2 in. x 1.3 in.
Weight (oz.) 3.29
Warranty Orion 1 year limited warranty
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