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- Fully multi coated broadband green optics with superior optical performance, high clarity, and true magnification;
- 66 degree AFOV is ideal for broad field lunar observations, medium-sized star clusters, various cloud-like nebulae, and deep sky targets with extra clarity；
- Multiple lens groups combine to improve optical performance. The eyepiece group provides a clear image with good color correction and contrast;
- Blackened interior to eliminate light scatter, minimize internal reflections and maximize contrast;
- The aluminum 1.25-inch eyepiece tube is blackened on the inside to eliminate light scatter and is threaded to accept 1.25-inch filters.
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Great eyepiece for the money!
This review is for the gold rimmed 20mm eyepieces.
I've been looking through telescopes for a very long time and this eyepiece gives you a lot of bang for the buck!
I bought two to use in my large binoculars and they have not disappointment me at all. The eye relief is very nice and I wear glasses. They are bright and clear and easy to look through. I did not measure the FOV, but it is wide and comfortable. I had originally tried the 9mm red rimmed ones, but the eye relief was not good for me so I returned them. I think the Gold rimmed ones are the way to go! The Gold rimmed ones seated perfectly and securely in my binoculars with no wobble whatsoever. I am 100% confident they will stay locked in the eyepiece holders of my binos which are APM 70-90's. They work great.
I rated these with five stars because overall they are worth this rating.
The only reason of concern would be that there is a small bit of aberration at the very edges. This is really negligible, but worth noting if you are looking for edge to edge perfection.
You won't regret your purchase if you go with the Gold rimmed ones! i am very happy and plan to buy the 15mm ones next.
| MODEL | F9157A | F9157B | F9157C | F9157D |
| Focal Length | 6mm | 9mm | 15mm | 20mm |
| Barrel Size | 1.25" | 1.25" | 1.25" | 1.25" |
| Eye Relief | 16mm | 16mm | 16mm | 16mm |
| Apparent Field of View | 66° | 66° | 66° | 66° |
| Filter Threads Standard | 1.25" Filter | 1.25" Filter | 1.25" Filter | 1.25" Filter |
| Coating | Fully Multi-Coated | Fully Multi-Coated | Fully Multi-Coated | Fully Multi-Coated |
| Structure Design | 5-elements in 3 groups | 6-elements in 4groups | 4-elements in 3 groups | 5-elements in 3groups |
| Rubber Eye Guard | Yes | Yes | Yes | Yes |
1. Fixed folding rubber eyecup allows easy use with or without eyewear
2. Svbony astronomy eyepiece body is made of aluminum. A two-step anodizing process results in a beautiful matte finish that resists reflections and glare
3. Sturdy anodized aluminum barrels are threaded for any Svbony 1.25" Astronomy Filters
4. The edges of the optics are blackened for increased contrast, and prevent internal reflections
5. Anti-reflection fully multi-coated optics ensure bright and clear high-images at any magnification, with true color rendition
6. Suitable for observsing the surface of the moon, planets, nebulae, star clusters, diffuse nebulae and other celestial bodies etc
