Omegon Plössl 4mm 50° 1.25″ eyepiece
Plössl eyepieces have been among the most popular choices for amateur astronomers for decades - and for good reason. The four-element design (two symmetrically arranged doublets) delivers a bright, high-contrast image with minimal aberrations, all at a price that suits both beginners and more experienced observers. The Omegon Plössl 4mm with a 1.25″ barrel is a compact and reliable eyepiece that fits easily into any modern telescope with a standard 1.25″ focuser.
Wide field of view and high magnification
Compared to the basic eyepieces that often come bundled with telescopes, the Omegon Plössl offers a noticeably wider 50° apparent field of view. This means you can see many objects in their entirety, without constantly having to move the telescope from side to side. With its short 4mm focal length, this eyepiece provides high magnification - ideal for detailed observation of planets, the Moon, or double stars. And thanks to the generous field of view, longer observing sessions remain comfortable.
Excellent performance even with fast telescopes
One of the strengths of this eyepiece is its ability to produce sharp images even with optically demanding "fast" telescopes - those with a focal ratio of f/5 or lower. The lower the f-number, the greater the light-gathering power of the telescope, but also the higher the demands placed on the eyepiece quality. Anti-reflection coatings on all optical surfaces reduce unwanted reflections and light scatter, so images appear bright, vivid and well-contrasted.
Solid build with practical features
The eyepiece body is made of metal, ensuring long-term durability and resistance to everyday use. Soft rubber eyecups effectively block stray light from the sides, improving image contrast and making it easier and more comfortable to keep your eye in position - something you will appreciate during longer observing sessions. A standard filter thread on the telescope-side barrel is a useful bonus: simply screw in a lunar, nebula or any other standard 1.25″ filter and you are ready to observe.
Part of a complete eyepiece range
Omegon Plössl eyepieces are available in a wide range of focal lengths, so you can build a well-thought-out set of magnifications tailored to your needs and the type of telescope you use. The short 4mm focal length is suited to high magnification when observing fine details on planets and the Moon, while longer focal lengths are better for wide-field views of nebulae, star clusters or galaxies. Thanks to the uniform 1.25″ standard, all eyepieces in the range are interchangeable.
About the Omegon brand
Omegon is a well-established brand in the field of astronomical optics and accessories, trusted by amateur astronomers across Europe. Omegon products are designed with a focus on practicality, optical performance and affordability - making quality astronomy equipment accessible not only to the most experienced or well-funded observers. The Plössl eyepiece range is a clear example of this philosophy: a proven optical design, solid construction and a reasonable price that may leave you with budget to spare for additional accessories or filters.
Technical specifications
| Parameter |
Value |
| Focal length |
4mm |
| Apparent field of view |
50° |
| Barrel diameter |
1.25″ |
| Optical design |
Plössl (4 elements in 2 doublets) |
| Coatings |
Anti-reflection on all optical surfaces |
| Body material |
Metal |
| Eyecup |
Rubber |
| Filter thread |
Standard 1.25″ |
Why choose the Omegon Plössl 4mm?
- High magnification for detailed views of planets, the Moon and double stars
- 50° apparent field of view - wider than most entry-level eyepieces
- Performs well with fast telescopes (f/5 and below)
- Anti-reflection coatings for bright, high-contrast images
- Metal body for long-lasting durability
- Rubber eyecup blocks stray light and improves comfort
- Standard 1.25″ filter thread included
- Compatible with all telescopes using a standard 1.25″ focuser
If you are looking for an eyepiece that combines solid optical performance, practical features and a sensible price, the Omegon Plössl 4mm is a choice that will not disappoint. Pay attention to what truly makes the difference in your observing experience - quality optics at both ends of the telescope.
