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

SKU: ONSP20 MFR: 08733

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$39.95
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Due to Manufacturer Restrictions, This Item can NOT be Shipped to California.

Orion 20mm Sirius: Picture 1 regular $39.95

About 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
Mfr #
08733
SKU
ONSP20
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