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  1. FLI Research Grade 50mm Square Ha 3nm

    FLI - Research Grade 50mm Square Ha - 3nm

    FLI's high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. FLI offers a full line of filter types and sizes.

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    (48 States)
    Model#: RG-50S-HA3
    $1,250.00

  2. FLI - Research Grade 50mm Square Sulfur II - 3

    FLI - Research Grade 50mm Square Sulfur II - 3

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. FLI offers a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.

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    (48 States)
    Model#: RG-50S-SII3
    $1,250.00

  3. FLI Research Grade 50mm Square Oxygen III - 5nm

    FLI - Research Grade 50mm Square Oxygen III - 3nm

    FLI's high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. FLI offers a full line of filter types and sizes.

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    (48 States)
    Model#: RG-50S-OIII3
    $1,250.00

  4. Custom Scientific UBVRI 50mm Unmounted Round Filter Set

    Custom Scientific - UBVRI 50mm Unmounted Round Filter Set

    Custom Scientific UBVRI filters have been used in institutions and observatories around the world such as Kitt Peak, Mauna Kea, and the CTIO/Chile.

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    (48 States)
    Model#: CU-UBVRI50-SET
    $1,475.00

  5. Chroma filters

    Chroma Technology - 50mm x 50mm LRGB Filter Set - Square

    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#: LRGB-50S
    $1,085.00

  6. Chroma filters

    Chroma Technology - 50mm LRGB and Ha/8-50 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-50
    $1,305.00

  7. Chroma filters

    Chroma Technology - 50mm x 50mm LRGB Filter and Ha/8-50 Set - Square

    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-50S
    $1,525.00

  8. Astrodon Narrowband 50mm Unmounted NII 3 nm Square Filter

    Astrodon - Narrowband - 50mm Unmounted NII 3 nm Square Filter

    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),

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    (48 States)
    Model#: NII3-50S
    $1,250.00

  9. Astrodon - Narrowband - 50mm Unmounted SII 3 nm Square Filter

    Astrodon - Narrowband - 50mm Unmounted SII 3 nm Square Filter

    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),

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    (48 States)
    Model#: SII3-50S
    $1,250.00

  10. Astrodon - Narrowband - 65mm Unmounted H-Alpha 5 nm Square Filter

    Astrodon - Narrowband - 65mm Unmounted H-Alpha 5 nm Square Filter

    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),

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    (48 States)
    Model#: HA5-65S
    $1,050.00

  11. Astrodon - Narrowband - 50mm Unmounted OIII 3 nm Square Filter

    Astrodon - Narrowband - 50mm Unmounted OIII 3 nm Square Filter

    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),

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    (48 States)
    Model#: OIII3-50S
    $1,250.00

  12. Astrodon Narrowband 50mm Unmounted H-a 3 nm Square Filter

    Astrodon - Narrowband - 50mm Unmounted H-Alpha 3 nm Square Filter

    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),

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    (48 States)
    Model#: HA3-50S
    $1,250.00

  13. FLI - Research Grade 50mm Diameter UBVRI Filters

    FLI - Research Grade 50mm Diameter UBVRI Filters

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. FLI offers a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.

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    (48 States)
    Model#: RG-50D-UBVRI
    $1,495.00

  14. FLI - Research Grade 50mm Diameter LRGB filters

    FLI - Research Grade 50mm Diameter LRGB filters

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. FLI offers a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.

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    (48 States)
    Model#: RG-50D-LRGB
    $1,195.00

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