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Product description SVBONY SV220 H-Alpha and O-III 3nm Dual-Narrowband Filter enhances astrophotography by reducing stray light and light pollution, suitable for capturing deep-sky objects. High-Contrast Astrophotography Dual narrowband passbands at H-Alpha and O-III, with 3nm bandwidth for high contrast. ≥85% peak transmission captures faint details. Average OD5 blocks 99.999% stray light for clean images. Ideal for Astrophotography — Superior for capturing clear, high-contrast deep-sky images even under light-polluted skies. Q1: What’s the difference between SV220 3nm and 7nm filter? A: The key difference is bandpass width: SV220 Ultra-narrow 3nm bandpass for maximum stray light suppression; SV220 Wider 7nm bandpass; Allows faster exposure times while strong light pollution rejection. Q2: Which one is better for urban astrophotography? A:Choose 3nm if you prioritize maximum contrast against severe light pollution (e.g., city centers). Choose 7nm for faster capture speeds with excellent performance in moderate light pollution. Q3: Do both filters support full-frame cameras? A: Yes, but only the 2-inch version of either filter is full-frame compatible. The 1.25-inch version may cause vignetting on full-frame sensors. Q4: How do their transmission rates compare? A:SV220 3NM: Peak transmission >85% at Hα (656nm) and OIII (501nm). SV220 7NM: Peak transmission >90% at key wavelengths, capturing more signal for faster exposures. Q5: Do they suppress halos around bright stars? A: Yes! Both feature minimal-halo coatings: SV220 3NM: Advanced coating for near-zero halos in critical conditions. SV220 7NM: Optimized coating to minimize halos while maximizing light throughput. Specifications Product specification 1.25 inches Mirror ring size Φ31.75x7mm Thread type Single thread / Male thread Thread specification M28.5*0.6 Material 6061T aluminum profile Substrate thickness 2.0mm Aperture of light transmission 26mm Center wavelength 500.7/656.3nm Bandwidth/FWHM 3±1nm Cutoff wavelength 300-1050nm Cut-off depth average OD5 Surface quality 60/40 Surface flatness transmitted wave front PV≤λ/4a Parallelism 30″ Net weight 7g
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