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Explore Scientific

Explore Scientific S II 12 nm Narrowband Filter 2-Inch – 310110

Explore Scientific S II 12 nm Narrowband Filter 2-Inch – 310110

$209.99
$209.99
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The Explore Scientific S II 12 nm 2-inch Filter is a narrowband sulfur filter engineered to isolate the singly ionized sulfur (S II) emission line commonly found in emission nebulae and supernova remnants. With a 12 nm passband, this filter provides effective background suppression while maintaining strong signal transmission, making it suitable for advanced narrowband imaging.

Key Features

  • 12 nm Narrowband Passband: Optimized to isolate S II emission while reducing background skyglow.

  • Astrophotography Optimized: Ideal for monochrome imaging and narrowband combinations such as the Hubble palette (S II, H-alpha, O III).

  • Improved Nebular Contrast: Enhances faint sulfur structures in emission nebulae and supernova remnants.

  • High Transmission Optical Coatings: Advanced multi-layer coatings maximize throughput at the target wavelength while preserving image sharpness.

  • Precision Optical Glass: Optically polished glass substrates ensure consistent performance across the field of view.

  • Durable 2-Inch Filter Cell: Precision-machined, threaded metal housing fits standard 2-inch eyepieces, diagonals, filter wheels, and imaging accessories.

Specifications

  • Filter Type: S II (Singly Ionized Sulfur) Narrowband

  • Bandwidth: 12 nm

  • Barrel Size: 2-inch

  • Primary Use: Emission nebulae and supernova remnants

  • Optical Construction: Multi-coated optical glass

  • Compatibility: Fits standard 2-inch eyepieces, diagonals, filter wheels, and imaging accessories

  • SKU: 310110

Why It Matters
An S II filter is an essential component of serious narrowband astrophotography. The Explore Scientific S II 12 nm 2-inch filter enables cleaner sulfur signal capture and improved contrast, helping reveal subtle nebular structures even under light-polluted 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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