• SVBONY SV220 2" S-II & O-III Dual Band Filter for Astrophotography — Dual Narrowband Filter for Deep-Sky Imaging
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SVBONY SV220 2" S-II & O-III Dual Band Filter for Astrophotography — Dual Narrowband Filter for Deep-Sky Imaging | Telescope Wolves

SVBONY SV220 2" S-II & O-III Dual Band Filter for Astrophotography — Dual Narrowband Filter for Deep-Sky Imaging | Telescope Wolves

$169.99
$169.99
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The SVBONY SV220 2" S-II & O-III dual-band telescope filter helps one-shot-colour astrophotographers pull rich, high-contrast nebula detail out of the night sky without switching filters or moving to a mono camera. It passes only two narrow slivers of light — the sulphur-II line at 672nm and the oxygen-III line at 500.7nm — and blocks nearly everything else, so emission nebulae glow against a dark background.

"Narrowband" means the filter lets through only a very thin band of wavelengths (about 7nm here). That tight window cuts light pollution, keeps stars tight, and delivers cleaner, more colourful frames straight from the camera. The 2" size suits full-frame cameras and larger imaging trains.

Who it's for: Deep-sky imagers running a one-shot-colour (OSC) camera and a 2" filter train who want the "Hubble palette" look. Combine it with the SV220 H-Alpha & O-III filter for a full SHO set. New to filters? Read 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 one filter.
  • Tight 7nm bandwidth: boosts nebula contrast and rejects light pollution and moonlight.
  • High transmission: over 85% at the target wavelengths for efficient exposures.
  • Built for OSC cameras: narrowband-style results without a mono camera or filter wheel.
  • 2" mounted cell: fits 2" filter threads and drawers, ideal for full-frame sensors.
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 2" 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 strong contrast even from brighter skies.

Why choose the 2" version?
The 2" cell fully illuminates larger sensors, making it the better choice for full-frame cameras and 2" filter drawers.

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.

Can I use it with a colour camera?
Yes — it's designed for one-shot-colour cameras, so no mono camera or filter wheel is required.

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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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