At a Glance
15mm
Focal Length
68°
Apparent FOV
14mm
Eye Relief
1.25"
Barrel Size
Score Breakdown
Overview
The SVBONY SV131 15mm eyepiece sits in a useful middle ground for amateur astronomers. Its 15mm focal length delivers medium magnification, which means it works well for scanning large deep-sky objects like open clusters and nebulae in shorter focal length telescopes, while still pulling out reasonable planetary and lunar detail in longer focal length instruments. The 68-degree apparent field of view is genuinely wide enough to give you an immersive, window-like experience without the distortion that can creep in at more extreme field angles.
The four-element, three-group optical design is a step up from a basic Plossl, and the fully multi-coated glass helps transmission and contrast under dark skies. The internally blackened barrel is a practical touch that cuts down on internal reflections and keeps the image crisp. At $88.49, this eyepiece is priced competitively for its feature set, though buyers should know it is a 1.25-inch barrel, so it will not fit 2-inch focusers without an adapter.
It is a solid all-around eyepiece for someone building out a small collection, covering the most frequently used magnification range without breaking the budget.
Key Features
- 68-degree apparent field of view delivers a noticeably wider, more immersive view than standard Plossl eyepieces
- 15mm focal length covers medium magnification, useful for both deep-sky scanning and planetary observation depending on your telescope
- Fully multi-coated optics improve light transmission and improve contrast, which matters most on dim objects
- Four-element, three-group lens design improves sharpness compared to simpler two-group configurations
- Internally blackened barrel reduces stray light and internal reflections for a cleaner image
- 1.25-inch barrel fits the majority of consumer telescopes, though a 2-inch adapter is needed for larger focusers
- Priced under $90, making it a reasonable investment for a first wide-angle eyepiece without committing to premium glass
Specifications
| Focal Length | 15mm |
| Apparent FOV | 68° |
| Eye Relief | 14mm |
| Barrel Size | 1.25" |
| Design | Wide Angle |
| Elements/Groups | 5/3 |
| Series | 68° |
| Coating | Fully Multi-Coated |
| Waterproof | No |
Popular Telescopes for This Eyepiece
Sky-Watcher FlexTube 300 SynScan
100x / 3.0mm exit pupil / Dobsonian
Celestron NexStar 130SLT
43x / 3.0mm exit pupil / Newtonian
Sky-Watcher FlexTube 300P
100x / 3.0mm exit pupil / Dobsonian
Celestron 114LCM
67x / 1.7mm exit pupil / Newtonian
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