• Explore Scientific S-II 12nm Narrowband Filter 2"
  • Explore Scientific S-II 12nm Narrowband Filter 2"
  • Explore Scientific S-II 12nm Narrowband Filter 2"
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Explore Scientific

Explore Scientific S-II 12nm Narrowband Filter 2" — Sulfur-II Filter for Emission Nebula Imaging

Explore Scientific S-II 12nm Narrowband Filter 2" — Sulfur-II Filter for Emission Nebula Imaging

$180.00
$249.99 $180.00
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The Explore Scientific S-II 12nm Narrowband Filter (2") isolates the deep-red light of doubly-ionized sulfur (S-II, ~672nm) emitted by nebulae, for high-contrast narrowband astrophotography with larger cameras and 2" filter systems. It passes only the S-II line and blocks everything else — including light pollution and moonlight — so emission nebulae stand out sharply against a dark sky.

Who it's for

Astrophotographers using monochrome cameras with 2" filter wheels or drawers who want to image emission nebulae and shoot the Hubble palette. New to filters? See our guide to the best telescope filters for beginners.

Key features

  • Isolates the S-II line (~672nm) for high-contrast emission-nebula detail
  • 12nm bandwidth — versatile across a wide range of focal ratios
  • Strong light-pollution and moonlight rejection
  • 2" format for full-frame sensors and large imaging trains
  • Part of the S-II / H-Alpha / O-III set for Hubble-palette (SHO) images

Specifications

Type Narrowband S-II imaging filter
Emission line S-II (~672 nm)
Bandwidth 12 nm
Fitting 2" threaded
SKU 310110

Frequently asked questions

What camera do I need?
Narrowband filters are designed for monochrome astronomy cameras, combining separate S-II, H-Alpha, and O-III exposures into a color image.

Why the 2" size?
2" filters avoid vignetting with larger (full-frame) sensors and bigger imaging trains. Choose 1.25" for smaller cameras and filter wheels.

Does it help under light pollution?
Yes — passing only the S-II line blocks most artificial skyglow, so it's very effective from suburban skies.

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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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