• Explore Scientific S-II 12nm Narrowband Filter 1.25"
  • Explore Scientific S-II 12nm Narrowband Filter 1.25"
  • Explore Scientific S-II 12nm Narrowband Filter 1.25"
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Explore Scientific

Explore Scientific S-II 12nm Narrowband Filter 1.25" — Sulfur-II Filter for Emission Nebula Imaging

Explore Scientific S-II 12nm Narrowband Filter 1.25" — Sulfur-II Filter for Emission Nebula Imaging

$130.00
$159.99 $130.00
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The Explore Scientific S-II 12nm Narrowband Filter (1.25") isolates the deep-red light of doubly-ionized sulfur (S-II, ~672nm) emitted by nebulae, for high-contrast narrowband astrophotography. By passing only that single emission line and blocking everything else — including light pollution and moonlight — it makes emission nebulae stand out sharply against a dark sky.

Who it's for

Astrophotographers using monochrome cameras who want to image emission nebulae and shoot the classic "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 — a versatile passband that works well with a wide range of focal ratios
  • Strong light-pollution and moonlight rejection for imaging from brighter skies
  • Part of the S-II / H-Alpha / O-III set used to create Hubble-palette (SHO) images
  • 1.25" mounted and threaded for filter wheels and drawers

Specifications

Type Narrowband S-II imaging filter
Emission line S-II (~672 nm)
Bandwidth 12 nm
Fitting 1.25" threaded
SKU 310115

Frequently asked questions

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

12nm or a narrower 6.5–7nm filter?
12nm is more forgiving and works with faster telescopes; a narrower passband gives higher contrast and better light-pollution rejection but is best with slower focal ratios.

Will it help under light pollution?
Yes — by passing only the S-II line, it blocks most artificial skyglow, making it 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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