• Explore Scientific H-Alpha 7nm Narrowband Filter 2"
  • Explore Scientific H-Alpha 7nm Narrowband Filter 2"
  • Explore Scientific H-Alpha 7nm Narrowband Filter 2"
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Explore Scientific

Explore Scientific H-Alpha 7nm Narrowband Filter 2" — Ultra-Narrow Passband for Wide-Field Nebula Imaging

Explore Scientific H-Alpha 7nm Narrowband Filter 2" — Ultra-Narrow Passband for Wide-Field Nebula Imaging

$225.00
$299.99 $225.00
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The Explore Scientific H-Alpha 7nm Narrowband Filter (2") isolates the red light of hydrogen-alpha (H-Alpha, 656nm) with a tight 7nm passband, for maximum-contrast narrowband astrophotography on 2" filter systems. The narrower bandwidth blocks even more light pollution and skyglow than a 12nm filter, revealing faint nebula detail against a very dark background — ideal for imaging from suburban skies.

Who it's for

Astrophotographers using monochrome cameras with 2" filter wheels or drawers who want the highest H-Alpha contrast, especially under light pollution. New to filters? See our guide to the best telescope filters for beginners.

Key features

  • Isolates the H-Alpha line (656nm) with a tight 7nm passband
  • Maximum contrast and superb rejection of light pollution and moonlight
  • Reveals faint nebula structure for deep, detailed images
  • 2" format for full-frame sensors and large imaging trains
  • Part of the S-II / H-Alpha / O-III (SHO) set

Specifications

Type Narrowband H-Alpha imaging filter
Emission line H-Alpha (656 nm)
Bandwidth 7 nm
Fitting 2" threaded
SKU 310140

Frequently asked questions

7nm or 12nm?
7nm gives higher contrast and better light-pollution rejection, best with slower focal ratios; 12nm is more forgiving with fast telescopes. Both isolate the same H-Alpha line.

What camera do I need?
It's designed for monochrome astronomy cameras. Pair with S-II and O-III for full-color SHO (Hubble-palette) images.

Can I image under a bright Moon?
Yes — the tight passband rejects most skyglow and moonlight, so H-Alpha imaging works even on bright nights.

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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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