• SVBONY SV220 1.25" S-II & O-III Dual Band Filter for Astrophotography — Dual Narrowband Filter for Deep-Sky Imaging
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Svbony

SVBONY SV220 1.25" S-II & O-III Dual Band Filter for Astrophotography — Dual Narrowband Filter for Deep-Sky Imaging | Telescope Wolves

SVBONY SV220 1.25" S-II & O-III Dual Band Filter for Astrophotography — Dual Narrowband Filter for Deep-Sky Imaging | Telescope Wolves

$104.99
$104.99
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The SVBONY SV220 1.25" S-II & O-III dual-band telescope filter lets one-shot-colour astrophotographers capture rich, high-contrast nebula images without swapping between separate filters or switching to a mono camera. It passes only two narrow slices of light — the sulphur-II line at 672nm and the oxygen-III line at 500.7nm — while blocking almost everything else, so glowing emission nebulae stand out sharply against a dark sky.

"Narrowband" simply means the filter admits a very thin band of wavelengths (here about 7nm wide). That tight bandwidth cuts through light pollution and keeps stars tighter, giving cleaner, more colourful results straight out of the camera.

Who it's for: This filter is made for deep-sky imagers using a one-shot-colour (OSC) camera who want the "Hubble palette" look. Pair it with the SV220 H-Alpha & O-III filter to build a full SHO set. New to filters? Start with our guide to the best telescope filters for beginners.

  • Dual narrowband design: isolates the S-II (672nm) and O-III (500.7nm) emission lines in a single filter.
  • Tight 7nm bandwidth: maximises nebula contrast and suppresses light pollution and moonlight.
  • High transmission: over 85% at the target wavelengths for bright, efficient exposures.
  • Built for OSC cameras: get narrowband-style results without a mono camera or filter wheel.
  • Standard 1.25" mounted cell: threads into 1.25" filter threads, nosepieces and filter drawers.
Specifications
Filter type Dual-band narrowband (S-II + O-III)
Passbands S-II 672nm, O-III 500.7nm
Bandwidth 7nm
Peak transmission >85%
Size / fitting 1.25" mounted (threaded cell)
Best used with One-shot-colour (OSC) astro cameras

What does a dual-band S-II/O-III filter do?
It passes only the S-II and O-III emission lines that many nebulae glow in, blocking light pollution so those targets show up with strong contrast even from brighter skies.

Can I use it with a colour camera?
Yes. It's designed for one-shot-colour cameras, so you get narrowband-style images without needing a monochrome camera and filter wheel.

How do I get the Hubble (SHO) palette?
Combine this S-II/O-III filter with the matching SV220 H-Alpha & O-III filter and map the channels in processing.

Will it help under light pollution?
Yes. The 7nm bandwidth rejects most artificial skyglow, making it well suited to suburban and city imaging of emission nebulae.

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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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