Celestron Oxygen III Narrowband Filter 1.25" (93619)
$329.00
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Celestron Oxygen III Narrowband Filter 1.25" (93619)
$329.00
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Light Pollution Shield
Blocks urban sky glow
F/2 Optimized
Engineered for fast optics
High Transmission Rate
Passes critical emission lines
Schott Glass Substrate
Flat precision optical glass
Direct Integrated Mount
Replaces standard optical window
High Contrast Imaging
Darkens sky background tone
Deep Sky Nebular ContrastUnlocking Emission Nebula Detail
The Narrowband Hα-Hβ-OIII Imaging Filter, RASA 8 brings out stunning hidden detail in emission nebulae by blocking light pollution and isolating key emission spectrum wavelengths. Designed specifically for ultrafast optical systems, this specialized astrophotography filter dramatically boosts target contrast against dark sky backgrounds. Upgrade your Celestron RASA 8 telescope setup to capture breathtaking deep-space astrophotography even from light-polluted suburban yards.
Engineered For Fast OpticsCustom Spectral Bandpass Isolation
Unlike generic narrow-band filters that cause spectral shifts and severe light loss when paired with fast optical systems, the Narrowband Hα-Hβ-OIII Imaging Filter, RASA 8 is custom engineered to maintain a high 85%+ transmission at key wavelengths (486nm, 496nm/501nm, 656nm) specifically at F/2. Constructed from precision Schott B270 glass with multi-layer anti-reflection coatings, this filter drops directly into the internal filter mount of your 8-inch Rowe-Ackermann Schmidt Astrograph. By effectively isolating H-Alpha, H-Beta, and OIII emission lines while suppressing artificial urban lighting and natural sky glow, this nebula filter ensures maximum image contrast without dimming critical deep-sky detail.
Filter SpecificationsPrecision Optics and Build Metrics
Glass Type
Schott B270
Glass Thickness
2mm / 0.078"
Filter Diameter
46mm / 1.81"
Clear Aperture
43mm / 1.69"
Coatings
Dichroic multi-bandpass and multi-layer anti-reflection coatings
Filter Cell
Black anodized aluminum with knurled rim
Transmission Rate
≥85% at 486nm, 496nm, 501nm, and 656nm (percent)
Optical Compatibility
8" Rowe-Ackermann Schmidt Astrograph F/2
Astro Imaging FeaturesTargeted Emission Wavelength Isolation
Light Pollution SuppressionSelectively blocks artificial sky glow while preserving nebula details
F/2 System CompatibilityCustom engineered to eliminate spectral shift on fast optical systems
Key Line IsolationHigh transmission for H-Alpha, H-Beta, and OIII emission lines
Direct Drop-In FitFits directly into the RASA 8 front lens cell filter mount
Optical QualityPrecision flat Schott B270 glass with anti-reflection coatings
Included Storage AccessoriesShips with foam-lined protective case and individual spectral graph
Frequently Asked QuestionsEverything you need to know
What astrophotography targets work best with the Narrowband Hα-Hβ-OIII Imaging Filter, RASA 8?
The Narrowband Hα-Hβ-OIII Imaging Filter, RASA 8 excels on emission nebulae such as the Orion Nebula (M42), North America Nebula (NGC 7000), Lagoon Nebula (M8), and Carina Nebula (NGC 3372). It is not recommended for broadband targets like galaxies or star clusters.
How does the Narrowband Hα-Hβ-OIII Imaging Filter, RASA 8 install onto the telescope?
The Narrowband Hα-Hβ-OIII Imaging Filter, RASA 8 installs directly into the integrated filter mount located in the front lens cell of the RASA 8, replacing the clear placeholder optical window included with the telescope.
Can I use standard narrowband filters instead of the Narrowband Hα-Hβ-OIII Imaging Filter, RASA 8?
Standard off-the-shelf narrowband filters with narrower bandpasses suffer from spectral shift when used at fast F/2 steep light cones, causing critical light to be blocked. The Narrowband Hα-Hβ-OIII Imaging Filter, RASA 8 is specifically tailored to pass key emission wavelengths at F/2 without dimming your subject.
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