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Silver 1.25 inch telescope eyepiece with black barrel and rubber grip

Celestron

Celestron Omni 4 mm 1.25" Plossl Eyepiece

SKU CH-K1HV-XWSNY

A 4 mm Plössl eyepiece with a 50-degree apparent field and 1.25" barrel for high-power planetary viewing

  • Sharp, high-contrast views from premium four-element Plossl design
  • Broad 50-degree apparent field shows more of the night sky
  • Comfortable 6 mm eye relief suits spectacle wearers
  • 25" barrel fits a wide range of telescopes
  • Blackened lens edges and multi-layer coatings cut internal reflections

Purpose and audience

The Celestron Omni 4 mm Plossl eyepiece is built for amateur astronomers who want high-power planetary and lunar views. Its four-element optical design and blackened lens edges reduce internal reflections for sharp, high-contrast images. The 50-degree apparent field of view gives a wide window on the night sky. It suits both beginners and experienced observers looking for a versatile 1.25" barrel eyepiece.

Build integration

The 1.25" barrel slides into any standard focuser or diagonal that accepts that diameter, so it works with a broad range of telescopes without adapters. Multi-layer coatings on every lens surface maximise light transmission and contrast. A two-step anodising process on the barrel suppresses stray reflections from the top of the eyepiece. Threaded barrels accept standard 1.25" filters for added flexibility.

Who it suits and who should look elsewhere

This eyepiece suits observers who want a short focal length for detailed planetary work and are comfortable with 6 mm eye relief. It is not for users who need longer eye relief for comfortable viewing with glasses, nor for those seeking ultra-wide apparent fields beyond 50 degrees. Buyers wanting a zoom or variable focal length should consider a different design.

Highlights

  • Sharp, high-contrast views from premium four-element Plossl design
  • Broad 50-degree apparent field shows more of the night sky
  • Comfortable 6 mm eye relief suits spectacle wearers
  • 25" barrel fits a wide range of telescopes
  • Blackened lens edges and multi-layer coatings cut internal reflections

Specifications

No published specifications for this item yet.

Questions about this item

How does the 4 mm focal length limit the magnification I can push on a typical telescope?

The 4 mm focal length sets the highest practical power; divide your telescope's focal length by 4 to find the magnification, and stop before the image dims or softens.

Does the eyepiece body heat up or draw power during an all-night session?

No, it is a passive optical component with no electronics, so it generates no heat and consumes no power regardless of how long you observe.

What must my telescope already have for this eyepiece to fit?

Your telescope needs a standard 1.25" focuser or diagonal, which is the barrel size this eyepiece uses.

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