Celestron Omni 4 mm 1.25" Plossl Eyepiece

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.