Sky-Watcher Plossl SWA 7mm 58° 1.25″ Eyepiece
The Sky-Watcher Plossl SWA 7mm eyepiece is a high-quality optical accessory designed for observers who seek a sharp, high-contrast, and immersive view of the night sky. With a 7mm focal length, this eyepiece is particularly well suited for observing planets, the Moon, and fine details in double stars. The short focal length combined with a wide field of view delivers powerful magnification without sacrificing observing comfort. The eyepiece is compatible with all telescope types equipped with the standard 1.25″ focuser barrel.
Optical Design and Image Quality
The Sky-Watcher SWA 7mm wide-angle eyepiece uses a hybrid Plossl optical system consisting of 5 lenses in 3 groups. This construction delivers exceptional sharpness across the entire field of view and minimizes optical aberrations such as spherical aberration and coma. The 58° apparent field of view provides a generous overview and a pleasant sense of immersion in the observed object.
All optical surfaces feature fully multi-coated (FMC) anti-reflection coatings that maximize light transmission and enhance contrast - particularly beneficial when observing faint objects or under light-polluted skies.
Comfort and Ergonomics
The 16mm eye relief and 7.1mm exit pupil ensure comfortable viewing even for eyeglass wearers. The generous eye relief allows you to maintain the full field of view without pressing your eye tightly against the eyepiece, making extended observing sessions more relaxed and reducing eye fatigue.
The eyepiece features a height-adjustable, twist-up eyecup with a soft rubber ring that protects the eye and blocks stray light. The rubber eyecup is comfortable to the touch and provides reliable cushioning against accidental impacts.
Build Quality and Dimensions
The metal barrel of 1.25″ diameter ensures a stable fit in the telescope focuser. The robust all-metal body is a guarantee of long service life and durability in the field.
| Parameter |
Value |
| Focal length |
7mm |
| Apparent field of view |
58° |
| Barrel diameter |
1.25″ |
| Optical design |
Plossl - 5 elements in 3 groups |
| Coating |
FMC (Fully Multi-Coated) |
| Eye relief |
16mm |
| Exit pupil |
7.1mm |
| Maximum outer diameter |
44mm |
| Total length |
74mm |
| Weight |
174g |
Who Is This Eyepiece For?
This eyepiece with FMC multi-coating is suitable for both beginner and experienced astronomers. It is an excellent choice for visual observation of:
- Planets - Jupiter, Saturn, Mars, Venus
- The Moon - surface details, craters, mountain ranges
- Planetary nebulae
- Globular star clusters
- Double stars
It performs particularly well with telescopes that have a longer focal ratio (f/8 and above). It can also be used for basic astrophotography in combination with a suitable adapter set.
About Sky-Watcher
Sky-Watcher is one of the most respected brands in the world of astronomical optics and telescopes. Their products are popular with both beginners and experienced observers for their outstanding price-to-performance ratio. The SWA (Super Wide Angle) eyepiece series represents Sky-Watcher's entry point into the world of wide-field observing without requiring a major investment. Every eyepiece passes strict quality control to meet the high standards of optical performance. Thanks to a global distribution network, Sky-Watcher products are widely available and fully supported worldwide.
