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  1. Astronomik - CLS Light Pollution Filter - 31mm Round Unmounted

    Astronomik - CLS Light Pollution Filter - 31mm Round Unmounted

    The Astronomik CLS is an excellent filter for black & white and color imaging of nebulae, galaxies and star clusters with astronomical instruments of any size.

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    Model#: CLS-31
    $79.95

  2. 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
    $69.95

  3. 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
    $55.95

  4. Astronomik 6 nm SII MFR Narrowband Filter - 31 mm Round Mounted

    Astronomik - 6nm SII MFR Narrowband Filter - 31mm Round Mounted

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    (48 States)
    Model#: SII6-31
    $249.95

  5. Astronomik 6 nm OIII MFR Narrowband Filter - 31 mm Mounted

    Astronomik - 6nm OIII MFR Narrowband Filter - 31mm Mounted

    The OIII line (501 nm) is located in the blue-green portion of the spectrum, making them very suitable for observing most planetary nebulae and supernovae remnants and other objects with doubly ionized oxygen.

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    Model#: OIIICCD6-31
    $249.95

  6. Optolong UBVRI Filter Set 31mm Unmounted

    Optolong - UBVRI Filter Set - 31mm Unmounted

    This photometric UBVRI filter set includes five 31mm unmounted filters: bright (U), blue (B), visual (V), red (R), and infrared (I).

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    Model#: UBVRI-31U
    $740.00

  7. 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
    $163.00

  8. 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
    $189.00

  9. 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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    (48 States)
    Model#: LRGB-31U
    $291.00

  10. 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
    $55.00

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

    Optolong - OIII CCD 12nm Filter - 31mm Unmounted

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    Model#: OIIICCD12NM-31U
    $130.00

  12. 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
    $153.00

  13. 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
    $190.00

  14. 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
    $193.00

  15. Astrodon Narrowband 50mm Unmounted SII 5 nm Filter

    Astrodon - Narrowband - 50mm Unmounted SII 5 nm Filter

    When it comes to Narrowband filters, no one knows more or does it better than Don Goldman of Astrodon Filters. Narrowband (NB) filters enhance contrast of emission objects by accepting only a narrow range of wavelengths around the emission lines of hydrogen (H-a, 656 nm), oxygen (OIII, 501 nm), sulfur (SII, 672nm) and others.

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    (48 States)
    Model#: SII5-50R
    $725.00

  16. 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
    $189.00

  17. 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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    (48 States)
    Model#: HaLRGB-31
    $755.00

  18. 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
    $109.95

  19. 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
    $169.95

  20. Astronomik - H-Alpha 6nm CCD Filter - 31mm Round Unmounted

    Astronomik - H-Alpha 6nm CCD Filter - 31mm Round Unmounted

    The Astronomik 6nm H-alpha filter is an extremely narrow emission-line filter for CCD photography.

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    (48 States)
    Model#: HA6-31
    $249.95

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