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  1. Astrodon - Photometric Sloan - 50mm Unmounted Gen2 z_s Edge Blackened Square Filter

    Astrodon - Photometric Sloan - 50mm Unmounted Gen2 z_s 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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    (48 States)
    Model#: z_s2-50S
    $440.00

  2. Astrodon 50mm Unmounted Clear Square Filter (UV-Blocked, No NIR Blocking)

    Astrodon - 50mm Unmounted Clear Square Filter (UV-Blocked, No NIR Blocking)

    Clear optical windows Pass all frequency of light to the detector.

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    (48 States)
    Model#: C2-50S
    $320.00

  3. Astrodon 65mm Unmounted Gen2 E-Series LRGB Square Filters (set of 4) with 5 nm H-a Filter

    Astrodon - 65mm Unmounted Gen2 E-Series LRGB Square Filters (set of 4) with 5 nm H-Alpha Filter

    The E-Series is designed for the red-sensitive Kodak full-frame detectors with the goal of equalizing the fluxes, and hence, the signal-to-noise, for the red, green and blue filters.

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    Model#: LRGB2HA5-E65S
    $3,150.00

  4. 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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    Model#: SII3-36R
    $650.00

  5. Astrodon UVenus 1.25" Mounted UV Filter

    Astrodon - UVenus - 1.25" Mounted UV Filter

    Astrodon introduces a breakthrough in UV filters for CCD imaging. A  durable, hard--coated UV filter of the highest quality having the best transmission available.

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    Model#: UVenus-27R
    $190.00

  6. Astrodon Gen2 E-Series LRGB (set of 4) Mounted in 31mm Inserts

    Astrodon - Gen2 E-Series LRGB (set of 4) Mounted in 31mm Inserts

    Astrodon Tru-Balance RGB filters have revolutionized CCD imaging. Their popularity is due to ease-of-use, high optical throughput and great resulting color for galaxies, star clusters and nebulae.  There are two varieties of Tru-Balance filters - E-Series and I-Series.

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    (48 States)
    Model#: LRGB2-E31R
    $525.00

  7. Astrodon Photometric UVBRIc 50mm Unmounted Rc Edge Blackened Square Filter

    Astrodon - Photometric UVBRIc - Johnson-Cousins 50mm Unmounted Rc Edge Blackened Square Filter

    UVBRI filters have been the standard for photometric measurements for decades.  They have evolved over time as technology changed.  H. Johnson in the 1950s and A.W.J. Cousins in the 1970s designed these filters for photomultiplier tubes (PMT).

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    (48 States)
    Model#: Rc*-50S
    $440.00

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