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Silver 1.25 inch barrel eyepiece with black rubber grip and green lens coatings

Tele Vue

Tele Vue Plossl 20mm 1.25" eyepiece camera accessory

SKU CH-M05Y-3FGBR

A 20 mm focal length eyepiece with a 1.25 inch barrel uses high-index glass and full multicoatings to reduce astigmatism and lateral colour for sharp, high-contrast views

  • TypeOther
  • Diffraction-limited on-axis performance ensures sharp central detail
  • High-index glass reduces edge astigmatism and lateral colour for cleaner field views
  • Full multicoatings maximise light transmission and contrast across the image
  • Blackened lens edges and anti-reflection threads suppress internal glare for deeper contrast
  • Sharper field keeps faint stars as distinct points for longer undriven observation

Tele Vue Plossl 20mm 1.25" eyepiece

This 20mm 1.25" eyepiece is built for visual astronomy using telescopes that accept 1.25" barrels. It suits observers who want sharp on-axis views and reduced edge aberrations across the field. The Plossl design uses high-index glasses to control astigmatism and lateral colour better than standard four or five-element alternatives.

Optical coatings and internal finishing

Full multicoatings on all air-to-glass surfaces maximise light transmission and contrast for faint objects. Blackened lens edges and internal anti-reflection threads suppress scattered light, helping to pull out low-contrast detail in star fields and nebulae. These measures work together to keep the background dark and the image crisp.

Mechanical fit and focusing

The 1.25" barrel slides into any standard 1.25" focuser or diagonal without adapters. A rubber grip ring provides secure handling in cold or damp conditions. The eyepiece is parfocal with other Tele Vue Plossls, so swapping focal lengths requires minimal refocus. Eye relief is fixed by the optical design; observers who wear glasses may find it short for comfortable viewing.

Highlights

  • Diffraction-limited on-axis performance ensures sharp central detail
  • High-index glass reduces edge astigmatism and lateral colour for cleaner field views
  • Full multicoatings maximise light transmission and contrast across the image
  • Blackened lens edges and anti-reflection threads suppress internal glare for deeper contrast
  • Sharper field keeps faint stars as distinct points for longer undriven observation

Specifications

TypeOther

Questions about this item

How often will the multicoatings on the 20mm Plossl need cleaning or replacement?

The full multicoatings are permanent lens treatments and do not wear out; only occasional gentle cleaning of fingerprints or dew is required.

What optical limit appears first during extended high-power sessions with the 1.25" eyepiece?

Eye relief and the 20mm focal length set the practical magnification ceiling before field curvature or vignetting become noticeable.

Does the 20mm Plossl generate noticeable heat or draw power during all-night observing?

The eyepiece is a passive optical component with no electronics, so it produces no heat and consumes no power.

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