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Player One Ha 7nm Narrowband Filter S-series – 1.25"
Player One Ha 7nm Narrowband Filter S-series – 2"
Player One Ha 7nm Narrowband Filter S-series – 1.25"
Player One Ha 7nm Narrowband Filter S-series – 2"

Player One Ha 7nm Narrowband Filter S-series

by Player One
SKU POA-HA7-125
CA$181.00 - CA$349.00
CA$181.00
CA$181.00 - CA$349.00
CA$181.00
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  • 7nm Hydrogen-alpha (Ha) Narrowband Filter
  • Available in 1.25" Threaded Cell and 2" Round Mounted Formats
  • Optimized for Monochrome CMOS/CCD Cameras
  • S-Series High-Transmittance Multi-Layer Coatings
  • Suppresses Light Pollution and Moonlight
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Player One Ha 7nm Narrowband Filter S-series

    This Player One S-series Hydrogen-alpha filter has a tight 7nm bandpass and is available in 1.25" and 2" sizes. It is designed for modern filter wheels, isolating the hydrogen-alpha emission line, the dominant wavelength in emission nebulae, to produce high-contrast images from light-polluted skies.

    7nm Bandpass: Maximum Contrast Under City Skies

    The core of this filter is its extremely narrow 7nm bandpass. This specification means the filter only allows a tiny sliver of the light spectrum to pass through to the sensor, centered on the emission line of ionized hydrogen. By aggressively blocking out broadband light sources like city glow, moonlight, and atmospheric airglow, the signal from the nebula is dramatically boosted relative to the background sky, revealing faint structures that would otherwise be lost.

    S-Series Optics: High-Transmittance Design in Two Sizes

    Player One's S-series filters are built on a high-quality optical glass substrate and utilize multi-layer composite coatings to ensure maximum signal capture. These advanced coatings deliver excellent light transmittance at the target wavelength, which helps to shorten required exposure times. The design also focuses on sharp cutoff rates to prevent signal contamination and superior halo control, ensuring that bright stars remain tight and free of distracting internal reflections.

    The Hubble Palette: Combining Ha with SII and OIII at 7nm

    Together with the matching SII and OIII 7nm filters (sold separately), this Ha filter lets you create false-color images in the Hubble Palette (SHO). By capturing data through each 7nm filter with a monochrome camera and mapping them to the Red (SII), Green (Ha), and Blue (OIII) color channels during processing, you can create the iconic gold-and-teal images made famous by the Hubble Space Telescope. This technique reveals scientific detail by separating the physical structures within nebulae like the Pillars of Creation in the Eagle Nebula (M16).

    7nm vs. Wider Bandpass Filters: The Exposure Time Trade-Off

    Compared to filters with a wider bandpass (such as 12nm or 35nm), a 7nm filter offers a significant advantage in contrast, especially from suburban or urban locations. The trade-off for this enhanced contrast is the need for longer individual sub-exposures to collect enough photons. For imagers in heavily light-polluted areas, the 7nm design is the superior choice for maximizing signal-to-noise ratio. In contrast, those under pristine dark skies might find a wider filter gathers signal more quickly on very faint targets.

  • How will the Player One 7nm Ha filter perform on the Orion Nebula (M42) from a Bortle 7 zone?

    This 7nm filter is ideal for that exact scenario. From a Bortle 7 zone, an unfiltered image of the Orion Nebula (M42) would be washed out. Using the Ha filter, you will isolate the hydrogen-alpha emission, dramatically darkening the sky background and revealing intricate details in the nebula's structure, including the faint outer loops that are normally invisible from the city.

    Which size should I choose for my camera and telescope?

    The 2" version is well-suited for fast optical systems: the larger clear aperture of the 2" format helps to prevent vignetting on the larger sensors often paired with fast astrographs. The 1.25" version comes in a standard 1.25" threaded cell for 1.25" filter wheels and drawers. While some narrowband filters can experience a slight band-shift with very fast optics, these S-series filters are designed with modern, high-performance coatings to minimize such effects.

    What is the advantage of separate 7nm Ha, SII, and OIII filters over a single dual-band or tri-band filter?

    The main advantage is data separation and processing flexibility. With individual Ha, SII, and OIII filters and a monochrome camera, you have complete control over the data from each emission line. This allows you to create Hubble Palette (SHO) images, natural-color H-O-O composites, or blend the narrowband data with RGB stars for a more realistic final image—options that are not possible with a one-shot-color dual-band filter.

    Can I use this 7nm Player One filter for visual observing?

    No, this filter is not recommended for visual use. A 7nm bandpass is extremely restrictive and will block almost all visible light, resulting in an image that is far too dim to see through an eyepiece. It is designed specifically for long-exposure astrophotography with sensitive monochrome cameras.

    Which threads do the 1.25" and 2" versions use?

    The 2" version is mounted in a standard cell with M48x0.75 threads and fits any astronomy filter wheel or accessory that accepts standard 2" mounted filters. The 1.25" version uses a standard 1.25" threaded cell for 1.25" filter wheels, drawers, and accessories.

    Will I see a difference with the 7nm Ha filter on broadband targets like the Andromeda Galaxy (M31)?

    For the most part, no. Broadband targets like the Andromeda Galaxy (M31) shine primarily through reflected starlight (continuum emission), which this filter is designed to block. While you might pick up some faint Ha regions in the galaxy's spiral arms, the vast majority of the galaxy's light will be rejected. This filter is intended for emission nebulae, not galaxies or star clusters.

  • 1.25"

    Filter Type Narrowband Emission Line
    Bandpass 7nm
    Size 1.25"
    Series S-series
    Emission Line Hydrogen-alpha (Ha)

    2"

    Filter Type Narrowband Emission Line
    Bandpass 7nm
    Size 2" (Round Mounted)
    Series S-series
    Emission Line Hydrogen-alpha (Ha)

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