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31mm Filters

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  1. Optolong H-Alpha 12nm CCD Filter 31mm Unmounted

    Optolong - H-Alpha 12nm CCD Filter - 31mm Unmounted

    The Optolong H-Alpha 12nm Narrowband Filter works by permitting a 12nm light bandwidth, focused on the 656nm wavelength through, and hindering the transmission of contrast-killing light pollution wavelengths.

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    Model#: HAL12-31U

    Available - Ships in 2-4 Days

    $163.00

  2. Optolong OIII CCD 6.5nm Filter - 31mm Unmounted

    Optolong - OIII CCD 6.5nm Filter - 31mm Unmounted

    The Optolong Oxygen III 6.5nm Extra Narrowband Filter transmits a 6.5nm bandwidth of light that is focused at 500nm and radically decreases other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural).

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    Model#: OIIICCD65-31U

    Available - Ships in 2-4 Days

    $189.00

  3. Optolong OIII CCD 12nm Filter - 31mm Unmounted

    Optolong - OIII CCD 12nm Filter - 31mm Unmounted

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    Model#: OIIICCD12NM-31U

    Available - Ships in 2-4 Days

    $130.00

  4. Optolong SII CCD 12nm Filter - 31mm Unmounted

    Optolong - SII CCD 12nm Filter - 31mm Unmounted

    The Optolong Sulfur II 12nm Narrowband Filter works by allowing a 12nm bandwidth of light, centered on the 672nm wavelength through, and blocking contrast-killing light pollution wavelengths from coming through.

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    Model#: SIICCD12-31U

    Available - Ships in 2-4 Days

    $153.00

  5. Optolong H-Alpha 7nm CCD Filter 31mm Unmounted

    Optolong - H-Alpha 7nm CCD Filter - 31mm Unmounted

    The Optolong H-Alpha 7nm is a very narrow emission-line filter that functions by permitting a 7nm light bandwidth, focused on the 656nm wavelength through, and obstructing the transmission of contrast-killing light-pollution wavelengths.

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    Model#: HAL7-31U

    Available - Ships in 2-4 Days

    $190.00

  6. Optolong SII CCD 6.5nm Filter - 31mm Unmounted

    Optolong - SII CCD 6.5nm Filter - 31mm Unmounted

    The Optolong Sulfur II 6.5nm Extra Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 672nm and radically decreases other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural).

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    Model#: SIICCD65-31U

    Available - Ships in 2-4 Days

    $193.00

  7. IDAS Hutech 31mm Unmounted LPS Filter

    IDAS - Hutech - 31mm Unmounted LPS Filter

    Light pollution suppression (LPS) filters are designed to suppress the common emission lines generated by artificial lighting, yet allow the important nebula emission lines to pass, thus enhancing the contrast of astronomical objects, particularly emission nebulae.

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    Model#: LPS-P2-31

    Available - Ships in 2-4 Days

    $189.00

  8. Astronomik - CLS CCD Light Pollution Filter - 31mm Round Unmounted

    Astronomik - CLS CCD Light Pollution Filter - 31mm Round Unmounted

    The Astronomik CLS CCD is suitable under light-polluted skies for DSLR Cameras, which have been remodeled for astronomical use.

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    Model#: CLSCCD-31

    Available - Ships in 2-4 Days

    $109.95

  9. Astronomik - H-Alpha 12nm CCD Filter - 31mm Round Unmounted

    Astronomik - H-Alpha 12nm CCD Filter - 31mm Round Unmounted

    The Astronomik H-alpha filter is a narrow band filter for CCD photography. The filter lets the H-alpha light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive.

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    Model#: HA12-31

    Available - Ships in 2-4 Days

    $169.95

  10. Astronomik - 12nm H-Beta CCD Filter - 31mm Round Unmounted

    Astronomik - 12nm H-Beta CCD Filter - 31mm Round Unmounted

    The Astronomik H-beta filter is a narrow band emission-line filter for CCD photography.

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    Model#: HBCCD-31

    Available - Ships in 2-4 Days

    $169.95

  11. Astronomik - OIII 12nm CCD Filter - 31mm Round Unmounted

    Astronomik - OIII 12nm CCD Filter - 31mm Round Unmounted

    The Astronomik OIII CCD filter is a narrow band emission-line-filter for CCD photography.

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    Model#: OIIICCD-31

    Available - Ships in 2-4 Days

    $169.95

  12. Astronomik - SII 12nm CCD Filter - 31mm Round Unmounted

    Astronomik - SII 12nm CCD Filter - 31mm Round Unmounted

    The Astronomik SII-CCD filter is a narrow-band-filter for CCD photography.

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    Model#: SII-31

    Available - Ships in 2-4 Days

    $169.95

  13. Chroma filters

    Chroma Technology - Blue 31mm Diameter Filter - Unmounted

    Extremely durable coatings withstand humidity changes, extreme temperature fluxes and remain spectrally accurate in CWL and band pass adherence.

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    Model#: Blue-31

    Available - Ships in 2-4 Days

    $130.00

  14. Chroma Technology - Green 31mm Diameter Filter - Unmounted

    Chroma Technology - Green 31mm Diameter Filter - Unmounted

    Extremely durable coatings withstand humidity changes, extreme temperature fluxes and remain spectrally accurate in CWL and band pass adherence.

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    Model#: Green-31

    Available - Ships in 2-4 Days

    $130.00

  15. Chroma Technology - Red 31mm Diameter Filter - Unmounted

    Chroma Technology - Red 31mm Diameter Filter - Unmounted

    Extremely durable coatings withstand humidity changes, extreme temperature fluxes and remain spectrally accurate in CWL and band pass adherence.

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    Model#: Red-31

    Available - Ships in 2-4 Days

    $130.00

  16. Chroma filters

    Chroma Technology - Luminance 31mm Diameter Filter - Unmounted

    Extremely durable coatings withstand humidity changes, extreme temperature fluxes and remain spectrally accurate in CWL and band pass adherence.

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    Model#: Lum-31

    Available - Ships in 2-4 Days

    $130.00

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