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SVBONY 9mm 66° Ultra Wide Angle Eyepiece - 1.25"
The SVBONY 9mm 66° Ultra Wide Angle Eyepiece has a wide 66° apparent field of view, expanding your perspective on celestial objects. Its 6-element, 4-group optical design gives good color correction and contrast, and the comfortable 16mm of eye relief makes it accessible for observers with or without eyeglasses. The standard 1.25" barrel is threaded for filters and fits nearly any telescope focuser.
The 66° Apparent Field: A Wider Window on Planets and Clusters
With an apparent field of view of 66°, this eyepiece offers a more immersive experience than the typical 50-52° field of a standard Plössl. This wider canvas allows you to frame the entire disk of Jupiter with its Galilean moons, or fit more stars from open clusters like the Pleiades (M45) into a single view without panning your telescope.
6-Element Optical Design: Contrast-Enhancing Coatings and Baffles
This eyepiece uses a 6-element optical design arranged in 4 groups for good color correction and contrast. Every glass surface is fully multi-coated with a broadband green coating to maximize light transmission and reduce reflections. The interior of the aluminum housing is blackened to absorb stray light, ensuring a darker background and improving visible contrast on faint nebulae and galaxies.
Comfortable Viewing with 16mm of Eye Relief
A generous 16mm of eye relief means you do not have to press your eye against the lens. This is particularly beneficial for observers who wear eyeglasses, as it provides enough distance to observe comfortably. The included folding rubber eyecup helps to block stray light and properly position your eye for a stable view.
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How does the SVBONY 9mm eyepiece perform on Jupiter with an 8" f/6 Dobsonian?
In a typical 8" f/6 Dobsonian (1200mm focal length), the SVBONY 9mm eyepiece will yield 133x magnification. This is an excellent power for resolving Jupiter's main cloud bands and the Great Red Spot when seeing conditions are stable. The 66° field of view will be wide enough to comfortably track the planet and keep its moons in the same frame.
Is the SVBONY 9mm a good choice for viewing the Orion Nebula (M42) in a small refractor?
Yes. In a short-tube refractor, like a 70mm f/5.7 (400mm focal length), this eyepiece provides 44x magnification. This low-to-medium power is ideal for framing large objects like the Orion Nebula (M42). The 66° ultra-wide field will help capture the nebula's full expanse and surrounding star field.
What is the main advantage of the SVBONY 9mm 66° field over a standard 9mm Plössl?
The primary advantage is the significantly larger apparent field of view (66° vs. ~52°). This creates a more engaging "spacewalk" feeling and makes it easier to find and track objects, as you have more sky to work with. While a Plössl is a sharp eyepiece, the SVBONY 66° design provides a more immersive context around your target.
Can I use the SVBONY 9mm eyepiece with eyeglasses?
Usually, yes. 16mm of eye relief suits most eyeglass wearers; fold down the rubber eyecup to bring your glasses closer to the lens. Whether you see the very edge of the field with glasses on depends on your frames.
Does the SVBONY 9mm eyepiece accept 1.25" filters?
Yes, the 1.25" barrel of the eyepiece is threaded to accept standard 1.25" astronomy filters, such as moon filters, color filters for planetary observing, or light pollution filters.
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| Brand |
SVBONY |
| Model |
F9157B |
| SKU |
SV-F9157B |
| Focal Length |
9mm |
| Apparent Field of View |
66° |
| Barrel Size |
1.25" |
| Eye Relief |
16mm |
| Optical Design |
6 elements in 4 groups |
| Coatings |
Fully multi-coated (broadband green) |
| Filter Threads |
Standard 1.25" |
| Eyecup |
Folding rubber eyecup |
| Housing |
Aluminum, two-step anodized matte finish, blackened interior |
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SVBONY 9mm 66° Ultra Wide Angle Eyepiece - 1.25"
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SVBONY Warranty
