At a Glance
25mm
Focal Length
50°
Apparent FOV
17mm
Eye Relief
1.25"
Barrel Size
Score Breakdown
Overview
The SVBONY 25mm Plossl is a practical, no-frills eyepiece that earns its place in a beginner's kit. At 25mm focal length, it delivers moderate magnification, making it a natural starting point for scanning the Moon, splitting brighter binary stars, and getting your bearings on larger deep-sky objects like open clusters and nebulae. The 40-degree apparent field of view is on the narrower side compared to modern wide-angle designs, so do not expect sweeping vistas, but the view is clean and usable.
The fully multi-coated optics genuinely help here. At under $17, you might expect bare or single-coated glass, but the FMC treatment reduces light loss and improves contrast in ways you will notice, especially on faint targets. The blacked-out interior barrel cuts down on stray light scatter, which is a detail worth appreciating at this price point.
It accepts standard 1.25" filters via M28.5x0.6mm threads, so pairing it with a light pollution or moon filter is straightforward. The rubber grip ring and included plastic case are practical touches that protect a budget eyepiece you will likely reach for often. With over 1,000 Amazon reviews averaging 4.6 out of 5, it has a track record that backs up its value.
Key Features
- Fully multi-coated lenses improve brightness and contrast beyond what most budget eyepieces offer
- 25mm focal length provides moderate magnification, well suited for lunar viewing, star clusters, and initial object acquisition
- Standard 1.25" barrel fits virtually any beginner or intermediate telescope
- M28.5x0.6mm filter threads allow easy use of moon, light pollution, or narrowband filters
- Blacked interior barrel reduces internal reflections and stray light for cleaner views
- Rubber grip ring helps prevent accidental drops during nighttime handling
- Includes a protective plastic case, keeping the eyepiece dust-free between sessions
Specifications
| Focal Length | 25mm |
| Apparent FOV | 50° |
| Eye Relief | 17mm |
| Barrel Size | 1.25" |
| Design | Plossl |
| Elements/Groups | 4/2 |
| Series | Plossl |
| Coating | Fully Multi-Coated |
| Waterproof | No |
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Amazon Reviews
nice and clear. wider angle makes a clearer image
I didn't pay very much for this eyepiece, so I was really surprised to see how good it was for the money. I bought it primarily for stargazing. I wanted to bring the power on my 70mm Celestron spotting scope down to 10X (the longest focal length stock eyepiece it came with was 20mm, or 20X). This ey...
Great value! But beware, this focal length won't work well for fast scopes with large obscurations! Optical reality, not the fault of the eyepiece. For example - a 6" F4 Newtonian. The magnification will be 15X and the exit pupil diameter 10mm! A typical eye pupil is only 6mm, so you get the center ...
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