Celestron Omni 4mm Eyepiece - 1.25"
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Key Features
- High-magnification 4mm eyepiece, ideal for detailed views of the Moon and planets
- Proven Plössl optical design delivers sharp, high-contrast images at an accessible price
- Multi-coated optics and blackened edges enhance clarity and reduce reflections
- Comfortable fold-down rubber eyecup, suitable for both standard use and eyeglass wearers
- Durable matte aluminum body with a lightweight, compact design
- Standard 1.25" barrel compatible with a wide range of telescopes and filters
Description
Omni 4mm Plössl Eyepiece (1.25")
The Omni 4mm eyepiece is designed for observers who want high magnification with reliable optical quality, without stepping into premium price territory. Built around a classic Plössl optical design, it delivers sharp, contrast-rich views that are especially suited for detailed observations of the Moon and planets.
High Magnification for Planetary Detail
With its 4mm focal length, this eyepiece provides strong magnification on most telescopes. It’s ideal when you want to push your instrument to reveal finer details—such as lunar craters, Jupiter’s cloud bands, or Saturn’s ring structure.
The 50° apparent field of view offers a natural, well-balanced framing. While not ultra-wide, it keeps objects comfortably in view and maintains good edge sharpness, which is exactly what you want for high-magnification work.
Proven Plössl Optics
At its core, this eyepiece uses a 4-element, 2-group Plössl design, known for its excellent balance between performance and affordability. Combined with multi-coated optics, it ensures:
- Good light transmission
- Clear, bright images
- Reduced glare and reflections
The blackened lens edges further improve contrast, helping subtle details stand out—especially important when observing bright objects like the Moon.
Comfortable and Practical Design
Despite its compact size, the Omni 4mm is built for practical observing:
- Fold-down rubber eyecup: Improves comfort and blocks stray light; can be folded for eyeglass use
- Aluminum body with matte finish: Reduces reflections and provides a durable, high-quality feel
- Threaded 1.25" barrel: Compatible with standard filters (e.g., Moon or planetary filters)
The eyepiece is lightweight (just 36 g), making it easy to handle and well-suited for smaller setups.
Things to Keep in Mind
Due to its short focal length, the 6 mm eye relief is relatively tight. This is typical for high-magnification Plössl eyepieces and may feel less comfortable for extended viewing, especially if you wear glasses. However, for short, detailed observations, it performs very well.
Who is this product for?
- Amateur astronomers looking for an affordable high-magnification eyepiece
- Users who want to observe the Moon and planets in detail
- Beginners building a complete eyepiece set step by step
- Telescope owners needing a compact, lightweight planetary eyepiece
What’s in the box
- Omni 4mm Plössl Eyepiece (1.25")
- Protective caps (top and bottom)
This eyepiece is a solid choice if you’re aiming to expand your magnification range without compromising on essential optical quality. It’s simple, effective, and focused on delivering the kind of detail that makes planetary observing rewarding.
Technical Specification
| General | |
|---|---|
| Barrel Size: | 1.25" (32mm) |
| Focal Length: | 4mm (0.16") |
| Eyepiece Type: | Plössl |
| Field Stop Diameter: | 4.6mm (0.18") |
| Apparent Field of View: | 50° |
| Number of Lens Elements: | 4 |
| Number of Lens Groups: | 2 |
| Optical Coatings: | Multi-Coated |
| Eye Relief: | 6mm (0.24") |
| Parfocal Eyepieces: | No |
| Filter Threads: | Yes |
| Eye Guard: | Yes - Fold down |
| Body Material: | Aluminum |
| Waterproof: | No |
| Dimensions: | 40.8mm x 34mm x 34mm (1.60" x 1.34" x 1.34") |
| Weight: | 1.26 oz (36 g) |
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