Bresser Plössl PL 20mm 50° 1.25″ eyepiece
Are you looking for an eyepiece that delivers a comfortable view of star clusters, nebulae and planets without unnecessarily complicating your time at the telescope? The Bresser Plössl PL 20mm eyepiece is exactly the kind of accessory you will quickly grow fond of - whether you are a beginner astronomer or an experienced observer seeking a reliable and affordable addition to your eyepiece collection. A focal length of 20mm makes it a versatile choice for medium magnification, suitable for a wide range of astronomical objects.
Classic Plössl optical design
The eyepiece is built on the classic and time-proven Plössl design, which uses four lenses arranged in two symmetrical groups. This construction is popular among astronomers for its outstanding balance between image quality and price - it delivers sharp, high-contrast images with minimal chromatic aberration across the entire field of view. The apparent field of view reaches 50°, which is the classic and comfortable value for a Plössl, allowing relaxed observation of moving objects without the need for constant refocusing or adjustment of the telescope's position. All optical elements feature multi-layer anti-reflection coatings that maximise light transmission and suppress unwanted reflections - the result is a bright, crisp image with well-rendered detail.
Practical design for everyday use
The 20mm focal length eyepiece with 1.25″ barrel fits the standard focuser of virtually any amateur telescope - refractors, Newtonian reflectors and catadioptric systems alike. The eyepiece head features a foldable rubber eyecup that you can easily adjust to your needs - fold it down for observing with glasses, or unfold it for precise eye relief positioning. The barrel body is made of metal, ensuring a solid feel in the hand, resistance to mechanical impacts and long service life even with regular use in the field. At only 95g, the weight is especially appreciated when working with sensitively balanced mounts. The lower part of the barrel is threaded for filters, so you can attach standard 1.25″ astronomical filters - lunar, planetary or narrowband - without any adapters.
Who is this eyepiece for?
The Bresser Plössl PL 20mm is an excellent choice as a first quality eyepiece for a beginner who wants to replace the basic eyepiece supplied with their telescope, but it also serves an experienced observer equally well as a practical backup or as part of a well-planned eyepiece set covering various magnifications. A focal length of 20mm provides a comfortable medium magnification of around 35-50× on a typical telescope with a focal length of 700-1000mm - ideal for observing star clusters, extended nebulae or the Moon in all their beauty.
Key specifications
| Parameter |
Value |
| Optical design |
Plössl (4 elements in 2 groups) |
| Focal length |
20mm |
| Apparent field of view |
50° |
| Barrel diameter |
1.25″ |
| Optical coatings |
Multi-layer anti-reflection |
| Body material |
Metal |
| Eyecup |
Foldable rubber |
| Filter thread |
Standard 1.25″ |
| Weight |
95g |
Main benefits at a glance
- Universal 20mm focal length - suitable for star clusters, nebulae, the Moon and planets
- Classic Plössl design with sharp, high-contrast images across the full 50° field of view
- Multi-layer coatings for maximum light transmission and reduced reflections
- Compatible with virtually all amateur telescopes with a 1.25″ focuser
- Solid metal body for durability and long service life
- Foldable rubber eyecup - comfortable for both glasses wearers and naked-eye observers
- Built-in 1.25″ filter thread - no adapters required
- Lightweight at just 95g - suitable for balanced mounts
- An ideal first upgrade eyepiece or a reliable addition to an existing eyepiece set
