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  1. Optolong UV-IR Cut Filter - 31mm Unmounted

    Optolong - UV-IR Cut Filter - 31mm Unmounted

    Improve image sharpness with the addition of an Optolong UV-IR Cut Filter, which blocks Ultraviolet and Infrared transmissions yet lets the visible spectral lines shine through. The IR (700nm to 1100nm) and UV (300nm - 400nm) part of the spectrum are not detectable to human eyes, however not to most CCD and other computerized cameras, which are sensitive to 300nm to 1100nm.

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    Model#: UVIR-31U

    Available - Ships in 2-4 Days

    $55.00

  2. 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

  3. 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

  4. 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

  5. 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

  6. Optolong LRGB CCD Filter Set - 31mm Unmounted

    Optolong - LRGB CCD Filter Set - 31mm Unmounted

    The Optolong LRGB Filter Set includes four 31mm unmounted filters, including Red, Green, Blue, and Luminance. They're suitable for de-bayered monochrome CCD and CMOS cameras, and function remarkably for both planetary and deep sky imaging.

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    Model#: LRGB-31U

    Available - Ships in 2-4 Days

    $291.00

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  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 filters

    Chroma Technology - 31mm LRGB Set - 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#: CT-LRGB-31

    Available - Ships in 2-4 Days

    $495.00

  15. Chroma filters

    Chroma Technology - 31mm LRGB and Ha/8-31 Set - 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#: HaLRGB-31

    Available - Ships in 2-4 Days

    $755.00

  16. 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

  17. Astronomik - ProPlanet 642 BP IR-Pass Filter - 31mm

    Astronomik - ProPlanet 642 BP IR-Pass Filter - 31mm

    and enhance contrast when used for lunar- and planetary imaging, and third it will be a very ... Learn More
    Model#: P642-31

    Available - Ships in 2-4 Days

    $69.95

  18. Astronomik - Planet IR Pro 807 Filter - 31mm Round Unmounted

    Astronomik - Planet IR Pro 807 Filter - 31mm Round Unmounted

    The Astronomik ProPlanet 807 filter is a deal addition to the Astronomik ProPlanet 742 for imaging the moon and planets, with telescopes larger then 10" (250mm) when the seeing is poor.

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    Model#: P807-31

    Available - Ships in 2-4 Days

    $55.95

  19. Astronomik - Planet IR Pro 742 Filter - 31mm Round Unmounted

    Astronomik - Planet IR Pro 742 Filter - 31mm Round Unmounted

    advantage is that the sky background of advanced dawn is dark and so the filter even allows photography of the planets and the moon at daylight. ... Learn More
    Model#: P742-31

    Available - Ships in 2-4 Days

    $55.95

  20. 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

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