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  1. Custom Scientific "I" Research Grade Filter 1.25" Round Mounted

    Custom Scientific - "I" Research Grade Filter - 1.25" Round Mounted

    With over 20 years in the business, Custom Scientific UBVRI filters are popular photometric tools that have built in Infrared blocking for more efficient and higher quality CCD imaging.

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    Model#: CU-125I
    $175.00

  2. Custom Scientific "B" Research Grade Filter - 1.25" Round Mounted

    Custom Scientific - "B" Research Grade Filter - 1.25" Round Mounted

    With over 20 years in the business, Custom Scientific UBVRI filters are popular photometric tools that have built in Infrared blocking for more efficient and higher quality CCD imaging.

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    Model#: CU-125B
    $175.00

  3. Custom Scientific - "U" Research Grade Filter - 1.25" Mounted

    Custom Scientific - "U" Research Grade Filter - 1.25" Mounted

    With over 20 years in the business, Custom Scientific UBVRI filters are popular photometric tools that have built in Infrared blocking for more efficient and higher quality CCD imaging.

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    Model#: CU-125U
    $175.00

  4. Custom Scientific "V" Research Grade Filter 1.25" Round Mounted

    Custom Scientific - "V" Research Grade Filter - 1.25" Round Mounted

    With over 20 years in the business, Custom Scientific UBVRI filters are popular photometric tools that have built in Infrared blocking for more efficient and higher quality CCD imaging.

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    Model#: CU-125V
    $175.00

  5. Custom Scientific - "R" Research Grade Filter - 1.25" Round Mounted

    Custom Scientific - "R" Research Grade Filter - 1.25" Round Mounted

    With over 20 years in the business, Custom Scientific UBVRI filters are popular photometric tools that have built in Infrared blocking for more efficient and higher quality CCD imaging.

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    Model#: CU-125R
    $175.00

  6. Custom Scientific H-Alpha 656.3/4.5 nm Filter 1.25" Round Mounted

    Custom Scientific - H-Alpha 656.3/4.5 nm Filter - 1.25" Round Mounted

    The Custom Scientific H-Alpha 656.3/4.5 nanometer filter is a great accessory for imaging emission nebulae which emit large amounts of the H-Alpha spectral line at a 4.5 nanometer bandpass due to excited hydrogen atoms.

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    FREE SHIPPING
    (48 States)
    Model#: CU-HA45NM-125
    $600.00

  7. Custom Scientific H-Alpha 656.3/4.5 nm Filter 50mm Round Unmounted

    Custom Scientific - H-Alpha 656.3/4.5 nm Filter - 50mm Round Unmounted

    The Custom Scientific H-Alpha 656.3/4.5 nanometer filter is a great accessory for imaging emission nebulae which emit large amounts of the H-Alpha spectral line at a 4.5 nanometer bandpass due to excited hydrogen atoms.

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    Model#: CU-HA45NM-50
    Call for pricing.

    Out of stock

  8. FLI - Research Grade 65mm Square Hb 5.8nm

    FLI - Research Grade 65mm Square Hb 5.8nm

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    FREE SHIPPING
    (48 States)
    Model#: RG-65S-HB
    $1,050.00

  9. Baader Planetarium - H-Alpha 35nm CCD Filter, 50.4 x 3mm Round

    Baader Planetarium - H-Alpha 35nm CCD Filter, 50.4 x 3mm Round

    Baader's new H-Alpha passfilter enables high-contrast deep sky images of H-II regions (such as the N. American Nebula).

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    FREE SHIPPING
    (48 States)
    Model#: FHAL-RD50
    $214.00

  10. Astro Optic 2" O-III Filter

    AstroOptic - 2" O-III Filter

    Oxygen III or OIII filters are mainly designed for viewing planetary nebulae that normally have extremely narrow pass bands in the oxygen spectral lines

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    Model#: Q1-OIII2-01

    Regular Price: $115.99

    Special Price: $89.99

  11. Astro Optic 1.25" CLS Filter

    AstroOptic - 1.25" CLS Filter

    Light pollution CLS Filters are designed to minimize the affects of light pollution by removing common nanometers and wavelengths found in artificial street lights in the city.

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    Model#: Q1-CLS125-01

    Regular Price: $103.99

    Special Price: $79.95

  12. AstroOptic - 2" CLS Filter

    AstroOptic - 2" CLS Filter

    Light pollution CLS Filters are designed to minimize the affects of light pollution by removing common nanometers and wavelengths found in artificial street lights in the city.

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    Model#: Q1-CLS2-01

    Regular Price: $116.99

    Special Price: $89.95

  13. DayStar Filters 2" UV/IR Filter

    DayStar Filters - 2" UV/IR Filter

    The DayStar 2" UV/IR Filter blocks the heat from reaching your filter and diagonal by blocking all other parts of the spectrum in the UV and IR. The filter is best for focal ratios between f/0.5 and f/50.

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    Model#: DSIUV2
    $109.00

  14. Lunt Solar Systems 2" Polarizing Filter for White Light Solar Wedge

    Lunt - 2" Polarizing Filter for White Light Solar Wedge

    2" Polarizing Filter (1 unit), to be used with the LUNT 2" White Light Solar-Wedge / Herschel-Wedge.

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    Model#: PF-1
    $74.50

  15. Orion 1.25" Orion Mars Observation Eyepiece Filter

    Orion - 1.25" Orion Mars Observation Eyepiece Filter

    The custom-designed Orion Mars Observation filter enhances contrast of virtually all surface features.

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    Model#: 05599
    Orion Winter Accessory Extravaganza (ends Feb 16, 2016)!

    Regular Price: $53.99

    Special Price: $45.89

  16. Orion 1.25" Luminance/IR Cutoff Astrophotography Filter

    Orion - 1.25" Luminance/IR Cutoff Astrophotography Filter

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    Model#: 05564
    Orion Winter Accessory Extravaganza (ends Feb 16, 2016)!

    Regular Price: $53.99

    Special Price: $45.89

  17. Orion 1.25" Sulfur-II Extra-Narrowband Filter

    Orion - 1.25" Sulfur-II Extra-Narrowband Filter

    Now you can capture dramatic Hubble-like CCD images of emission nebulas from the heart of the city or under a full Moon.

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    Model#: 05579
    $168.29

  18. Orion OIII Nebula Telescope Filter 2"

    Orion - OIII Nebula Telescope Filter 2"

    You can't turn up the luminosity on nebulas, but you can crank up the contrast between them and the sky to reveal more of their wondrous detail.

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    Model#: 05582
    Orion Winter Accessory Extravaganza (ends Feb 16, 2016)!

    Regular Price: $168.99

    Special Price: $143.64

  19. Orion 1.25" Hydrogen-Beta Eyepiece Filter

    Orion - 1.25" Hydrogen-Beta Eyepiece Filter

    A Hydrogen-Beta telescope filter may be the only way to see the faint and elusive Horsehead, California, and Cocoon Nebulas.

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    Model#: 05583
    Orion Winter Accessory Extravaganza (ends Feb 16, 2016)!

    Regular Price: $116.99

    Special Price: $99.44

  20. Orion 2" Hydrogen-Beta Nebula Eyepiece Filter

    Orion - 2" Hydrogen-Beta Nebula Eyepiece Filter

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    Model#: 05584
    Orion Winter Accessory Extravaganza (ends Feb 16, 2016)!

    Regular Price: $136.99

    Special Price: $116.44

Items 21 to 40 of 454 total

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