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SVBONY SV220 7nm Ha/OIII Dual-Band Filter

SVBONY SV220 7nm Ha/OIII Dual-Band Filter

by SVBONY
SKU SV-W9172A
$74.65 - $122.02
$74.65
$74.65 - $122.02
$74.65
Price Match Policy!
  • Passes H-alpha (656.3nm) and OIII (500.7nm) wavelengths
  • Narrow 7nm bandpass for high-contrast imaging
  • Designed for one-shot color (OSC) cameras
  • Available in 1.25" and 2" mounted formats
  • OD5 blocking (2" version)
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SVBONY SV220 7nm Ha/OIII Dual-Band Filter

    The SVBONY SV220 7nm Ha/OIII Dual-Band Filter isolates the two most important emission lines for nebula photography into a single, efficient filter for color cameras. Its tight 7nm FWHM bandpass at both H-alpha (656.3nm) and OIII (500.7nm) dramatically increases contrast by rejecting light pollution and skyglow. The 2" version features peak transmission of over 94% for H-alpha and over 90% for OIII, ensuring that faint nebulosity is captured while unwanted light is blocked to OD5.

    Dual 7nm Passbands: Isolating H-alpha and OIII with a 7nm Bandwidth

    This filter captures the two primary wavelengths emitted by most nebulae simultaneously. By passing only a narrow 7nm window of light around the red H-alpha line and the blue-green OIII line, the SV220 separates the glowing ionized gas of your target from the background sky. This high-contrast view reveals delicate structures in emission nebulae, planetary nebulae, and supernova remnants that would otherwise be lost in broadband images.

    >90% Transmission & OD5 Blocking: Maximizing Signal, Rejecting Light Pollution

    The SVBONY SV220 passes nebula signal while rejecting most other light. The 2" model's coatings achieve over 94% transmission at H-alpha and over 90% at OIII, feeding your sensor as many photons as possible from the target. The filter blocks light pollution sources like mercury vapor and sodium lamps, as well as natural skyglow, darkening the background even under moonlit or urban skies.

    One-Shot Color Imaging: Streamlined Bicolor Astrophotography

    Designed as the ideal partner for one-shot color (OSC) cameras, the SV220 simplifies your imaging workflow. It allows you to capture a full bicolor narrowband image without a filter wheel or multiple exposures with different filters. The camera's sensor automatically maps the 656.3nm H-alpha light to its red pixels and the 500.7nm OIII light to its green and blue pixels, creating a detailed and colorful final image from a single set of exposures.

    System Compatibility: 1.25" and 2" Formats for Telescopes f/4 and Slower

    Available as 1.25" and 2" mounted filters, the SV220 fits standard filter wheels and adapters. The 2" version uses a standard M48x0.75 thread. A critical limitation for this filter is optical speed; it is not recommended for telescopes faster than f/4. On very fast optical systems, the steep light cone causes a shift in the filter's passband, which can reduce or eliminate the transmission of the targeted H-alpha and OIII wavelengths.

  • What kind of astronomical objects is the SVBONY SV220 filter best for?

    The SVBONY SV220 is designed specifically for emission-line targets. It excels on emission nebulae like the North American Nebula (NGC 7000), planetary nebulae like the Dumbbell Nebula (M27), and supernova remnants like the Veil Nebula (NGC 6960). It is not effective for broadband targets like galaxies, star clusters, or reflection nebulae.

    How will the SVBONY SV220 perform on the Orion Nebula (M42) from a light-polluted city?

    The SVBONY SV220 is ideal for this scenario. The Orion Nebula (M42) is rich in both H-alpha and OIII. The filter's 7nm bandpass will reject the glow from city lights, darkening the sky background and dramatically increasing the contrast of the nebula's structure. You will be able to capture faint outer details and the intricate core structure that are typically washed out from urban locations.

    Can I use the SVBONY SV220 filter with my f/2 RASA or HyperStar system?

    No, this is not recommended. Narrowband filters like the SVBONY SV220 experience a "band-shift" effect in very fast optical systems (faster than f/4). The angle of the incoming light shifts the filter's passband away from the target 656.3nm and 500.7nm wavelengths, resulting in a significant loss of signal. For systems faster than f/4, you need filters specifically designed and tested for high-speed optics.

    Can I use the SVBONY SV220 filter with a monochrome camera?

    Yes. SVBONY designs the SV220 for both OSC and monochrome cameras, though it is most useful on OSC cameras. With a mono camera, both H-alpha and OIII light will be captured in the same frame, and you cannot separate them in post-processing. For monochrome imaging, using individual H-alpha and OIII filters is the standard method for creating a bicolor image.

    I have an 8" SCT at f/10. Is the SVBONY SV220 a good choice for imaging the Veil Nebula (NGC 6960)?

    Yes. At f/10 the SCT is well slower than the f/4 limit of the SVBONY SV220. The Veil Nebula is a classic supernova remnant that is very strong in both H-alpha and OIII, making it a perfect target for this filter. The filter will help bring out the delicate, filamentary structure of the nebula against the background sky.

    Can I use the SVBONY SV220 filter for visual observing?

    No. The SV220 is not suitable for visual observation, and it is not designed for the Sun. The 7nm bandpass is extremely restrictive and will result in an image that is far too dim for the human eye to see, even on very bright nebulae. For visual observation, you should use a broader "UHC" or OIII filter.

  • Brand SVBONY
    Model SV220
    Filter Type Ha/OIII dual-band narrowband filter
    Primary Use Astrophotography with one-shot color cameras
    Available Sizes 1.25" and 2" Round Mounted
    Passbands H-alpha (656.3nm) and OIII (500.7nm)
    Bandwidth (FWHM) 7nm at each passband
    2" Version Specifications
    Thread M48x0.75
    Clear Aperture 44mm
    Substrate Thickness 1.80mm
    Peak Transmittance (Ha) >94% at 656.3nm
    Peak Transmittance (OIII) >90% at 500.7nm
    Wavelength Range 300-1100nm
    Blocking Efficiency OD5
    Surface Quality 60/40
    Surface Parallelism 1/4 wave
    Net Weight 12.5g
    1.25" Version Specifications
    Detailed Specs Not published

    • SVBONY SV220 7nm Ha/OIII Dual-Band Filter

      × 1 (in selected 1.25" or 2" size)

  • SVBONY Warranty