SVBONY SV220 1.25" Dual Narrowband 3nm H-Alpha OIII Filter for CCD
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Key Features
Targets both H‑Alpha and OIII emission lines with a 3nm bandwidth, capturing fine nebula detail and enhancing contrast in deep‑sky astrophotography.
Filters out stray light and urban skyglow with high OD5 blocking while maintaining strong signal transmission for sharper imaging.
Multi‑layer minimal halo optical coating reduces glare and halos, improving image purity and color accuracy.
Delivers over 85% transmittance at key wavelengths, reducing required exposure times and boosting signal‑to‑noise performance.
Available in 1.25" threaded format, compatible with mainstream astrophotography gear for easy integration into your setup.
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This 3nm dual narrowband (H-Alpha + OIII) filter features an ultra-narrow FWHM bandwidth of only 3±1nm, which efficiently filters out background stray light. Combined with a wide cutoff wavelength range of 300-1050nm (covering ultraviolet to near-infrared spectra) and an average OD5 transmittance as low as 0.001%, it strongly suppresses light pollution and stray light, significantly improving the signal-to-noise ratio (SNR). Meanwhile, its high transmittance performance of over 85% greatly reduces exposure requirements.Even in heavily light-polluted urban environments, it enables fast capture of deep-sky objects. In addition, it adopts multi-layer minimal halo coating design, which effectively reduces glare and halo interference, enhances image contrast and color accuracy, improves the purity of deep-sky photography images.
This 3nm dual narrowband (H-Alpha + OIII) filter features an ultra-narrow FWHM bandwidth of only 3±1nm, which efficiently filters out background stray light. Combined with a wide cutoff wavelength range of 300-1050nm (covering ultraviolet to near-infrared spectra) and an average OD5 transmittance as low as 0.001%, it strongly suppresses light pollution and stray light, significantly improving the signal-to-noise ratio (SNR). Meanwhile, its high transmittance performance of over 85% greatly reduces exposure requirements.Even in heavily light-polluted urban environments, it enables fast capture of deep-sky objects. In addition, it adopts multi-layer minimal halo coating design, which effectively reduces glare and halo interference, enhances image contrast and color accuracy, improves the purity of deep-sky photography images.
Realistic works captured with this device
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Product specification
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1.25 inches
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Mirror ring size
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Φ31.75x7mm
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Thread Type
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Single Thread/Male Thread
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Thread Specifications
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M28.5*0.6
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Material
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6061T aluminum profile
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Substrate Thickness
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2.0 mm
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Aperture of light transmission
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26mm
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Center Wavelength
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500.7/656.3 nm
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Bandwidth/FWHM
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3±1nm
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Cutoff wavelength
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300-1050nm
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Cut-off depth
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average OD5
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Surface quality
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60/40
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Surface flatness
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transmitted wave front PV≤λ/4a
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Parallelism
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30″
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Net weight
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7g
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