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SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"

SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"

par SVBONY
UGC SV-W9187A
CA$235.00 - CA$235.00
CA$235.00
CA$235.00 - CA$235.00
CA$235.00
Égalisation de prix!
  • Complete 1.25-inch SHO (SII, H-Alpha, OIII) filter set
  • Tight 5nm bandpass for high-contrast imaging
  • Peak transmission rate of ≥90% at key wavelengths
  • OD5 blocking of light from 300-1000nm
  • 1/4λ surface parallelism for sharp stars
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE au Canada pour les commandes de plus de 500$.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SVBONY SV227 1.25" SHO 5nm Narrowband Filter Set

    The SVBONY SV227 1.25" SHO 5nm Narrowband Filter Set delivers the essential tools for creating high-contrast Hubble Palette images of deep-sky emission nebulae. This complete set isolates the critical emission lines of Sulfur-II at 671.6nm, Hydrogen-alpha at 656.3nm, and Oxygen-III at 500.7nm with a tight 5nm bandpass. With a peak transmission of ≥90% and OD5 blocking across the 300-1000nm spectrum, these filters capture faint nebula details while aggressively rejecting light pollution and moonlight.

    Isolate Key Nebula Emissions with a 5nm Bandwidth

    The core of narrowband imaging is isolating the specific wavelengths of light emitted by ionized gases in space. The SV227 set provides three filters precisely centered on these lines: 656.3nm for H-alpha, 500.7nm for OIII, and 671.6nm for SII. A narrow 5nm bandpass dramatically increases contrast by rejecting continuum emission from stars and suppressing skyglow, making faint structures within nebulae like the Pillars of Creation in the Eagle Nebula (M16) stand out against a dark background.

    ≥90% Peak Transmission and 1/4λ Surface Parallelism

    High transmission and optical precision are critical for capturing clean data. The SV227 filters ensure that over 90% of the targeted narrowband light reaches your sensor, minimizing exposure times. Each filter is polished to a 1/4λ surface parallelism, which prevents the introduction of astigmatism or other aberrations, keeping star shapes tight and round across the entire 26mm clear aperture.

    OD5 Blocking for Imaging Under Light-Polluted Skies

    For imagers in urban or suburban locations, aggressive blocking of unwanted light is non-negotiable. The SV227 filters provide an optical density (OD) of 5, which blocks out 99.999% of all light outside the 5nm passband, from 300nm to 1000nm. This deep blocking effectively eliminates gradients from streetlights, moonlight, and general skyglow, allowing you to capture clean, high-signal data even under compromised sky conditions.

    1.85mm Substrate with M28.5x0.6 Threads

    Built for reliability, each SV227 filter uses a 1.85mm thick glass substrate housed in a CNC-machined 6061T aluminum alloy cell. The standard M28.5x0.6 male threads ensure compatibility with any 1.25-inch filter wheel or drawer. The consistent 1.85mm thickness across the set helps maintain focus between filter changes, reducing the need for constant refocusing throughout an imaging session.

    Why Choose a 5nm Filter Set Over Wider Bandpasses?

    While wider filters (like 7nm or 12nm) can allow for slightly shorter sub-exposures, a 5nm bandpass offers a distinct advantage in contrast. The tighter window rejects more of the unwanted light immediately surrounding the emission line, which results in a darker sky background and smaller, more controlled stars. This trade-off makes the 5nm SV227 set an excellent choice for imagers prioritizing maximum detail and contrast, especially from light-polluted locations.

  • What is the primary advantage of the SVBONY SV227 5nm filter set?

    The primary advantage is its tight 5nm bandpass. This provides extremely high contrast by isolating the specific H-alpha, OIII, and SII emission lines while rejecting nearly all other light, including light pollution and starlight. This results in a darker sky background and more prominent nebula detail compared to wider filters.

    How will the SVBONY SV227 5nm filters perform on the Orion Nebula (M42) from a light-polluted suburb?

    The SV227 filters are ideal for this scenario. The Orion Nebula (M42) is rich in H-alpha and OIII emissions. The OD5 blocking will eliminate the vast majority of your suburban skyglow, and the 5nm bandpass will separate the faint, intricate structures of the nebula from the bright stars of the Trapezium, allowing you to capture far more detail than is possible with broadband or wider narrowband filters.

    Can I use the SVBONY SV227 SHO set with my color camera and 80mm f/6 refractor?

    While technically possible, this set is designed and optimized for monochrome astronomy cameras. Using these filters with a one-shot color (OSC) camera is highly inefficient, as the camera's color filter array will block most of the light that passes through the narrowband filter. For the best results and to create Hubble Palette images, you should pair the SV227 set with a monochrome camera and a filter wheel.

    Are the SVBONY SV227 filters parfocal with each other?

    The filters in the SV227 set are manufactured to be nearly parfocal. They all use the same 1.85mm substrate thickness, which means that any focus shift when switching between the H-alpha, OIII, and SII filters should be minimal. This saves time during an imaging session as you won't need to perform a major refocus after every filter change.

    What does OD5 blocking mean for the SV227 filters?

    OD5 stands for Optical Density 5. This is a logarithmic scale meaning the filters block 10^5, or 100,000 times, the amount of unwanted light. In practical terms, it means they transmit only 0.001% of light outside their specified passband across a wide spectrum from 300nm to 1000nm, ensuring exceptional rejection of light pollution and moonlight.

    Why does the SVBONY SV227 set include three separate storage cases?

    As listed in the box contents, each of the three filters (H-alpha, SII, OIII) comes with its own protective PP Storage Case. This prevents the filters from scratching or rubbing against each other during transport or storage and makes it easy to identify and handle them individually without exposing the others to dust or fingerprints.

  • Brand SVBONY
    Product Name SII & OIII & H-Alpha Filter Set
    SKU W9187A
    Filter Size 1.25-Inch
    Bandwidth 5nm
    Transmission Wavelengths 671.6nm (SII), 656.3nm (H-Alpha), 500.7nm (OIII)
    Peak Transmission ≥90%
    Blocking Strength OD5 @ 300-1000nm
    Cut-off Depth Average ≥ OD5
    Clear Aperture 26mm
    Surface Quality 60/40
    Surface Parallelism 1/4λ
    Parallelism 30"
    Substrate Thickness 1.85mm
    Threads M28.5x0.6 (Single Male Thread)
    Material 6061T Aluminum Alloy
    Cell Finish CNC Machined, Black Anodized
    Filter Dimensions Φ31.75 x 7mm
    Net Weight (per filter) 15g
    Net Weight (set) 140g

    • 1.25" H-alpha Filter (5nm)

      × 1

    • 1.25" SII Filter (5nm)

      × 1

    • 1.25" OIII Filter (5nm)

      × 1

    • PP Storage Cases

      × 3

  • SVBONY 1-Year Warranty