SVBONY SV115 O-III Filter
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The SVBONY SV115 is a 1.25-inch narrowband O-III filter designed to isolate the doubly ionized oxygen emission lines at 496nm and 501nm, making it highly effective for observing and imaging nebulae under light-polluted skies. It blocks most artificial light wavelengths while passing the specific wavelengths where emission nebulae shine brightest, resulting in noticeably improved contrast and detail. For its price point, it offers solid optical quality that makes it an attractive entry into narrowband visual and imaging astronomy.
Key Features & Specs
| Filter Type | Narrowband O-III targeting doubly ionized oxygen emission lines at 496nm and 501nm |
|---|---|
| Bandwidth | Approximately 7nm narrowband passband for strong light pollution rejection |
| Compatibility | Standard 1.25-inch barrel size fits most eyepieces, focusers, and camera nosepieces |
| Coating | Multi-layer anti-reflection coatings on optical glass for improved transmission and reduced halos |
| Frame Material | Aluminum alloy cell with blackened threads to minimize internal reflections |
| Best Objects | Planetary nebulae, supernova remnants, and emission nebulae such as the Veil and Crescent |
| Weight | Lightweight and compact, adding minimal bulk to eyepieces or camera setups |
Best for: Amateur astronomers and beginner astrophotographers who want an affordable narrowband O-III filter to enhance nebula contrast and cut through light pollution without a significant investment.