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TeleVue Plössl 20mm 50° Eyepiece - Used
TeleVue Plössl 20mm 50° Eyepiece - Used

TeleVue Plössl 20mm 50° Eyepiece - Used

by TeleVue
SKU U-TV-EAP-20.0
$71.29 - $71.29
$71.29
$71.29 - $71.29
$71.29
Price Match Policy!
  • Used, in perfect condition. Comes with original packaging and dust caps.
  • 20mm Focal Length
  • 50° Apparent Field of View
  • 1.25" Diameter Barrel
  • 15mm Eye Relief
  • 17.1mm Field Stop
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • TeleVue Plössl 20mm 50° Eyepiece - 1.25"

    The TeleVue Plössl 20mm 50° Eyepiece is a four-element symmetric design engineered to provide high-contrast lunar and planetary images in 1.25-inch format focusers. This focal length serves as a medium-power optic in most amateur telescopes, balancing magnification and exit pupil for deep-sky and solar system targets. Every air-to-glass surface features proprietary multi-coatings to reduce internal reflections and maximize transmission.

    17.1mm Field Stop and Framing Performance

    The 17.1mm field stop produces a 50° apparent field of view (AFOV) that remains sharp to the edge when used in telescopes with slower focal ratios. In an 8-inch f/10 Schmidt-Cassegrain, this eyepiece yields 100x magnification and a 0.5° true field, sufficient to frame the full disc of the Moon. This field diameter is physically constrained by the symmetric Plössl geometry to ensure stars do not suffer from significant edge-of-field aberrations.

    Optical Baffling and Contrast for Planetary Detail

    TeleVue utilizes high-index glass and blackened lens edges to minimize stray light scattering when observing bright targets like Jupiter or Venus. The simplified four-element layout has fewer air-to-glass surfaces than ultra-wide designs, which can reduce the probability of ghosting during lunar observations. This design provides a neutral color rendition, preserving the natural chromatic appearance of double stars like Albireo (Beta Cygni).

    15mm Eye Relief and Mechanical Compatibility

    With 15mm of eye relief, the TeleVue Plössl 20mm allows most observers to see the entire 50° field, though eyeglass wearers with thick frames may find the distance tight. The 1.25-inch barrel is threaded for standard filters and features a safety undercut to prevent the eyepiece from slipping out of the diagonal or focuser. At a weight of 3.8 oz, this optic is significantly lighter than wide-angle alternatives, reducing the need for mount rebalancing.

    TeleVue Plössl 20mm vs. 19mm Panoptic: Field vs. Eye Relief

    While the 19mm Panoptic offers a wider 68° apparent field, the TeleVue Plössl 20mm utilizes a simpler optical path that some observers prefer for critical on-axis planetary work. The 20mm Plössl is more compact and budget-accessible but offers slightly less eye relief (15mm) compared to the 19mm Panoptic (13mm, though with a different eye guard style). Choose the Plössl for high center-field contrast in long focal length refractors or SCTs.

  • Is the TeleVue Plössl 20mm suitable for use with a Barlow lens?

    Yes, the 20mm Plössl pairs well with the TeleVue 2x or 3x Barlow. When used with a 2x Barlow, it functions as a 10mm eyepiece with high contrast, while maintaining its original 15mm eye relief for comfortable high-power viewing.

    Can I use the TeleVue Plössl 20mm with a Dioptrx corrector?

    No, the 20mm Plössl is not directly compatible with the TeleVue Dioptrx astigmatism corrector. The Dioptrx requires specific eyeguard housing sizes found on longer focal length Plössls (32mm and 55mm) or Radian, Delos, and Nagler series eyepieces.

    Will the TeleVue Plössl 20mm work well in fast f/4 or f/5 Newtonian telescopes?

    While sharp on-axis, simple Plössl designs show astigmatism near the edge of the field in telescopes faster than f/5. For pinpoint stars to the edge in fast Dobsonians, consider the TeleVue Delos or DeLite series, though the 20mm Plössl remains an excellent center-field performer.

  • Model # EAP-20.0
    Focal Length 20 mm
    Barrel Size 1.25"
    Apparent Field of View 50°
    Eye Relief 15 mm
    Field Stop Diameter 17.1 mm
    Weight 3.8 oz (108 g)
    • TeleVue 20mm Plössl

      Dust Cap (Top)

      × 1

    • TeleVue 20mm Plössl Dust Cap Top

      Dust Cap (Top)

      × 1

    • TeleVue 20mm Plössl Dust Cap Bottom

      Dust Cap (Bottom)

      × 1

  • TeleVue 5-Year Limited Warranty for Telescopes and Accessories