• 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"
1 3

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
Sale Sold out
Shipping calculated at checkout.
Free ShippingTo the lower 48 US states
Price MatchFound it cheaper? We'll match
Secure CheckoutEncrypted payments
Beginner HelpAsk us before you buy

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.

View full details

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.
Orders are usually processed within 1–2 business days, and standard delivery takes 4–8 business days after that. You'll receive a shipping confirmation email with your tracking number as soon as your order ships. Free standard shipping applies to the 48 contiguous US states. For full details, visit our Shipping Policy.
You have 30 days from delivery to request a return. Items must be unused, unassembled, and in their original packaging with all accessories. To start a return, email info@telescopewolves.com with your order number — returns sent without approval can't be accepted. For change-of-mind returns, you cover return shipping and a 5% restocking fee applies. Refunds go back to your original payment method. See our full Refund Policy for details.
Yes! If you find a lower advertised price on an identical, new, in-stock item from an authorized online retailer within one month of your purchase, we'll refund you the difference (item price plus shipping, excluding taxes). Just email info@telescopewolves.com with your order number and a link or screenshot of the lower price. Learn more on our Price Match Guarantee page.
All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
Please inspect your order as soon as it arrives. If anything is damaged, defective, or incorrect, email info@telescopewolves.com within 48 hours of delivery with your order number, a short description, and photos of the item, and we'll arrange a replacement or refund.
Absolutely. Our team is available Monday to Friday, 9am–5pm EST. The best way to reach us is by live chat or by email at info@telescopewolves.com. You can also visit our Contact Us Page.