Svbony SV220 Dual-Band 7nm SII & OIII Nebula Filter - W9172

SVBONY SV220 SII & OIII 7nm Duo-Band Narrowband Filter (1.25" & 2")

The SVBONY SV220 SII & OIII 7nm Duo-Band Filter is designed for One-Shot Colour (OSC) astrophotographers who want to capture high-contrast narrowband images without using multiple filters or a monochrome camera. This filter isolates the SII (672 nm) and OIII (500.7 nm) emission lines with a tight 7 nm bandwidth, enhancing contrast, suppressing light pollution, and darkening the sky background.

When paired with the SV220 H-Alpha & OIII Duo-Band Filter, this filter enables OSC users to achieve the SHO (Hubble Palette) colour balance that traditionally requires a mono camera setup.

Key Features

• 7 nm narrowband transmission windows for both SII and OIII
• Peak transmission of ≥88% at 500.7 nm (OIII) and 672 nm (SII)
• Ideal for One-Shot Colour cameras (ZWO, QHY, Player One, SVBONY)
• Excellent for imaging emission nebulae, planetary nebulae, and supernova remnants
• Recommended for telescope systems f/4 and slower
• Reduces light pollution and enhances image contrast
• Enables OSC users to achieve SHO narrowband colour mapping

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Technical Specifications

Common Specifications (Both Sizes)

Model	SV220
Name	SII & OIII Duo-Band OSC Filter
Wavelength Range	300–1000 nm
Bandwidth (FWHM)	7 nm
Blocking	≥ OD5
Peak Transmission	≥ 88%
Surface Quality	60/40
Surface Parallelism	1/2 λ
Thread	Single-threaded

1.25" Version

Size	1.25"
Substrate Thickness	1.80 mm
Clear Aperture	26 mm
Thread	M28.5 × 0.6
Net Weight	7 g

2" Version

Size	2"
Substrate Thickness	1.85 mm
Clear Aperture	44 mm
Thread	M48 × 0.75
Net Weight	15–20 g

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Ideal For

• OSC cameras for narrowband imaging
• Light-polluted locations requiring selective wavelength filtering
• Capturing nebulae with strong SII & OIII emission
• Achieving SHO (Hubble Palette) with the SV220 filter pair
• Deep-sky imaging setups wanting improved contrast and detail

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Note: The 1.25" and 2" options share the same optical performance — only the size, clear aperture, and threading differ.