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  1. Chroma Technology Blue 27mm Diameter Filter Mounted

    Chroma Technology - Blue 27mm Diameter Filter - Mounted

    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-27
    $125.00

  2. Astrodon - 1.25" Gen 2 Mounted Y Filter

    Astrodon - 1.25" Gen 2 Mounted Y Filter

    NEW!  Astrodon introduces Generation 2 Sloan filters based upon ongoing input from research organizations.  The changes include

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    Model#: Y2-27R
    $200.00

  3. Opticstar - 1.25" High Transparency Imaging Filters

    Opticstar - 1.25" High Transparency Imaging Filters

    These high transparency filters from Opticstar are placed within a thin metal ring with a full 26mm clear aperture that threads into the barrel of any standard 1.25" eyepiece or filter wheel that can accept 1.25" filters.

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    Model#: OSRHRGBI

    Regular Price: $150.00

    Special Price: $142.50

  4. Astrodon - Narrowband - 36mm Unmounted H-Alpha 3 nm Filter

    Astrodon - Narrowband - 36mm Unmounted H-Alpha 3 nm 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#: HA3-36R
    $650.00

  5. Astrodon - Narrowband - 36mm Unmounted SII 3 nm Filter

    Astrodon - Narrowband - 36mm Unmounted SII 3 nm 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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    FREE SHIPPING
    (48 States)
    Model#: SII3-36R
    $650.00

  6. IDAS Hutech 1.25" Mars Filter

    IDAS - Hutech - 1.25" Mars Filter

    This filter is used to image Mars. It enhances the visibility of atmospheric water vapor clouds.

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    FREE SHIPPING
    (48 States)
    Model#: BE410
    $450.00

  7. IDAS - Hutech - 1.25" Venus Filter

    IDAS - Hutech - 1.25" Venus Filter

    This filter is used for imaging Venus (increases contrast for lower atmosphere cloud structures).

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    FREE SHIPPING
    (48 States)
    Model#: VW-1
    $495.00

  8. IDAS - Hutech - 1.25" Jupiter and Saturn Methane Filter

    IDAS - Hutech - 1.25" Jupiter and Saturn Methane Filter

    This filter is used to image Jupiter and Saturn. The bandpass enhances contrast in the methane band.

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    FREE SHIPPING
    (48 States)
    Model#: BPF
    $395.00

  9. Astrodon - Photometric Sloan - 50mm Unmounted Gen2 g' Edge Blackened Square Filter

    Astrodon - Photometric Sloan - 50mm Unmounted Gen2 g' Edge Blackened Square Filter

    NEW!  Astrodon introduces Generation 2 Sloan filters based upon ongoing input from research organizations.  The changes include

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    FREE SHIPPING
    (48 States)
    Model#: g'2-50S
    $440.00

  10. FLI - Research Grade 28mm Luminance Filter

    FLI - Research Grade 28mm Luminance Filter

    • FLI Research Grade filter sets are par focal to F4.5 (individual filters are also available, contact FLI)
    • Size: 28mm
    • Shape: round
    • Thickness: 3mm +/-0.1mm
    • Bandwidth: N/A
    • Parallelism: 30 second or better
    • Surface Flatness: 1/4 wave per inch
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    Model#: RG 28D L
    $140.00

  11. Opticstar - 1.25" Infra-Red Cut-Off Imaging Filter

    Opticstar - 1.25" Infra-Red Cut-Off Imaging Filter

    For the use in CCD imaging this high-transmission filter will exclude any IR wavelengths beyond H-alpha showing a very steep desirable curve.

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    Model#: OSRIFIR

    Regular Price: $45.00

    Special Price: $42.75

  12. Opticstar - 2" Nebula Deep Sky Filter

    Opticstar - 2" Nebula Deep Sky Filter

    This Opticstar 2" eyepiece is suitable for both visual observation and imaging these are all-in-one high-transmission deep sky filters.

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    Model#: OSRIFNEB2

    Regular Price: $105.00

    Special Price: $99.75

  13. Astrodon - 50mm Gen 2 Unmounted Y Filter

    Astrodon - 50mm Gen 2 Unmounted Y Filter

    NEW!  Astrodon introduces Generation 2 Sloan filters based upon ongoing input from research organizations.  The changes include

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    FREE SHIPPING
    (48 States)
    Model#: Y2-50R
    $400.00

  14. Astrodon - 50mm Gen 2 Unmounted Square Y Filter

    Astrodon - 50mm Gen 2 Unmounted Square Y Filter

    NEW!  Astrodon introduces Generation 2 Sloan filters based upon ongoing input from research organizations.  The changes include

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    FREE SHIPPING
    (48 States)
    Model#: Y2-50S
    $440.00

  15. Astrodon - 1.25" Gen 2 Parfocal UV Blocked Clear Filter

    Astrodon - 1.25" Gen 2 Parfocal UV Blocked Clear Filter

    Astrodon's new improvements of photometric Sloan filters generation 2 feature excellent out of band clocking and other edge-blackended compounds to reduce stray light reflections to assist in CCD imaging.

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    Model#: C2-27R_gen2
    $140.00

  16. Astrodon - 50mm" Gen 2 Parfocal UV Blocked Clear Filter

    Astrodon - 50mm" Gen 2 Parfocal UV Blocked Clear Filter

    Astrodon's new improvements of photometric Sloan filters generation 2 feature excellent out of band clocking and other edge-blackended compounds to reduce stray light reflections to assist in CCD imaging.

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    FREE SHIPPING
    (48 States)
    Model#: C2_50R_Gen2
    $250.00

  17. Astrodon - 50mm" Gen 2 Parfocal UV Blocked Clear Square Filter

    Astrodon - 50mm" Gen 2 Parfocal UV Blocked Clear Square Filter

    Astrodon's new improvements of photometric Sloan filters generation 2 feature excellent out of band clocking and other edge-blackended compounds to reduce stray light reflections to assist in CCD imaging.

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    FREE SHIPPING
    (48 States)
    Model#: C2_50S_Gen2
    $295.00

  18. Orion - 2" Extra-Narrowband Oxygen III Filter

    Orion - 2" Extra-Narrowband Oxygen III Filter

    If you're using a monochrome CCD camera like Orion's Parsec 8300M, these specialized "line" filters are the perfect complement. Orion's 2" Oxygen-III Filter has a full-width half maximum (FWHM) bandpass of just 7nm, ensuring high-contrast images, even in heavily light-polluted or brightly moonlit skies. The filter can be used separately or in combination with a filter wheel for advanced tri-color imaging of emission nebulae.

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    Model#: 05545
    $359.95

  19. Orion - 2" Extra-Narrowband Sulfur-II Filter

    Orion - 2" Extra-Narrowband Sulfur-II Filter

    Effectively blacken the background sky with extra-narrowband filters to produce striking, high-contrast astrophotography of emission nebulae. Orion's 2" Extra-Narrowband Sulfur-II Imaging Filter will do just that. It is ideal for use with monochrome CCD cameras like Orion's Parsec 8300M.

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    Model#: 05546
    $359.95

  20. Orion - 2" Extra-Narrowband Hydrogen Alpha Filter

    Orion - 2" Extra-Narrowband Hydrogen Alpha Filter

    Filter for astrophotography transmits 90% of light at 656.3nm wavelength (H-alpha).

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    Model#: 05547
    $359.95

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