• Explore Scientific O-III 12nm Narrowband Filter 2" — Reveal Oxygen Emission Nebulae in Wide-Field Imaging
  • Explore Scientific O-III 12nm Narrowband Filter 2" — view 2
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Explore Scientific

Explore Scientific O-III 12nm Narrowband Filter 2" — Reveal Oxygen Emission Nebulae in Wide-Field Imaging

Explore Scientific O-III 12nm Narrowband Filter 2" — Reveal Oxygen Emission Nebulae in Wide-Field Imaging

$139.99
$139.99
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The Explore Scientific O-III 12nm narrowband filter (2") reveals oxygen emission nebulae in wide-field views and imaging. This telescope filter passes only the narrow band of light emitted by doubly-ionized oxygen (OIII) while blocking most other light, dramatically increasing the contrast of planetary nebulae and supernova remnants against a darkened sky.

The larger 2-inch format suits big eyepieces and wide-field imaging trains, letting you frame extended nebulae like the Veil with high contrast even from light-polluted locations.

Who it's for

For visual observers and imagers using 2-inch gear who want maximum contrast on oxygen-rich nebulae. New to filters? See our guide to the best telescope filters for beginners.

Key features

  • 12nm OIII narrowband pass that isolates oxygen emission lines.
  • Strong light-pollution suppression for higher nebula contrast.
  • 2-inch format for wide-field eyepieces and imaging.
  • Reveals planetary nebulae and supernova remnants with striking contrast.
  • Threaded cell for 2-inch eyepieces, filter wheels, and accessories.
Specifications
Brand Explore Scientific
Model 310200
Type O-III narrowband nebula filter
Bandpass 12 nm (OIII)
Size 2-inch threaded

Frequently asked questions

What does an OIII filter show best?
Oxygen-rich objects like planetary nebulae and supernova remnants, with strongly boosted contrast.

Is the 2-inch version better than 1.25-inch?
The 2-inch fits larger, wide-field eyepieces and 2" imaging trains; the 1.25-inch suits smaller eyepieces. Choose to match your gear.

Will it help under light pollution?
Yes. It passes only the OIII band, suppressing most skyglow so faint nebulae stand out.

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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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