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  1. Astronomik CLS CCD Light Pollution Filter - SC Rear Cell
  2. Astronomik - OIII Filter - SCT Rear Cell

    Astronomik - OIII Filter - SCT Rear Cell

    the Astronomik OIII filter has been very specifically designed for the visual observation of gaseous and planetary nebulae. ... Learn More
    Model#: OIII-SCT
    $199.95

  3. Astro Optic 1.25" O-III Filter

    AstroOptic - 1.25" 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-OIII125-01

    Regular Price: $102.99

    Special Price: $79.99

  4. Astro Optic 1.25" UHC Filter

    AstroOptic - 1.25" UHC Filter

    The UHC, otherwise known as the Ultra High Contrast Filter is designed for viewing nebulae under a dark sky by filtering out certain wavelengths

    ...
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    Model#: Q1-UHC125-01

    Regular Price: $103.99

    Special Price: $79.99

  5. 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

    ...
    Learn More
    Model#: Q1-OIII2-01

    Regular Price: $115.99

    Special Price: $89.99

  6. Astro Optic 2" UHC Filter

    AstroOptic - 2" UHC Filter

    The UHC, otherwise known as the Ultra High Contrast Filter is designed for viewing nebulae under a dark sky by filtering out certain wavelengths

    ...
    Learn More
    Model#: Q1-UHC2-01

    Regular Price: $116.99

    Special Price: $89.99

  7. Baader Planetarium - 	Neutral Density 1.8 Filter - 2"

    Baader Planetarium - Neutral Density 1.8 Filter - 2"

    The Baader Planetarium Neutral Density 2" 1.8 Filter is threaded for 48mm metric threads and has a 1.6% transmission rate, making it remarkable for observing the moon with large aperture optical tubes. NOTE: Use the filter with the AstroSolar Density 3.8 Film for safe solar observing.

    ...
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    Model#: BPND18
    $58.00

  8. Baader Planetarium - 1.25" Polarization Filter - Double

    Baader Planetarium - 1.25" Polarization Filter - Double

    The Baader Planetarium 1.25" Polarization filter can be threaded directly into an eyepiece, thereby making the switch from 1.25" eyepieces easy without removing the filter and maintaining a close distance between the eyepiece and filter.

    ...
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    Model#: FPOL-1D
    $97.00

  9. Baader Planetarium 2" Polarization Filter - Double

    Baader Planetarium - 2" Polarization Filter - Double

    The Baader 2" Polarizer can attacha a T2-15 adapter, enabling the use of 1.25" eyepiece without removing the filter while keeping the eyepiece and filter position close.

    ...
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    Model#: FPOL-2D
    $137.00

  10. Baader Planetarium 2" Polarization Filter - Single

    Baader Planetarium - 2" Polarization Filter - Single

    The Baader 2" Polarizer can attacha a T2-15 adapter, enabling the use of 1.25" eyepiece without removing the filter while keeping the eyepiece and filter position close.

    ...
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    Model#: FPOL-2
    $83.00

  11. FCB-2

    Baader Planetarium - Contrast Booster 2" Filter

    Much more than a simple minus-violet filter. Based on the popular Baader Moon&Skyglow filter, the Baader Contrast-Booster takes contrast enhancement and skyglow reduction to the maximum level possible from a filter

    ...
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    Model#: FCB-2
    $123.00

  12. Baader Planetarium - Contrast-Booster Filter - 1.25"

    Baader Planetarium - Contrast-Booster Filter - 1.25"

    The Baader Planetarium 1.25" Contrast Booster Filter is a remarkable accessory for all refractive optical systems!

    ...
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    Model#: BPCB125
    $74.00

  13. Baader Planetarium - Contrast-Booster Filter - 2"

    Baader Planetarium - Contrast-Booster Filter - 2"

    The Baader Planetarium 2" Contrast Booster Filter is a remarkable accessory for all refractive optical systems!

    ...
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    Model#: BPCB2
    $115.00

  14. Baader Planetarium Polarizing Filter - 1.25"

    Baader Planetarium - Polarizing Filter - 1.25"

    For observers who enjoy lunar viewing, the Baader Planetarium Polarizing Filter is a perfect option. It provides variable neutral density as it is rotated to accommodate different lunar stages.

    ...
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    Model#: BPPOL125
    $58.00

  15. Baader Planetarium Polarizing Filter - 2"

    Baader Planetarium - Polarizing Filter - 2"

    For observers who enjoy lunar viewing, the Baader Planetarium Polarizing Filter is a perfect option. It provides variable neutral density as it is rotated to accommodate different lunar stages.

    ...
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    Model#: BPPOL2
    $87.00

  16. Baader Planetarium - UHC-S High Transmission Nebula Filter - 1.25"

    Baader Planetarium - UHC-S High Transmission Nebula Filter - 1.25"

    A new generation of light pollution rejection/nebula filter.

    ...
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    Model#: BPUHCS125
    $85.00

  17. Baader Planetarium - UHC-S High Transmission Nebula Filter - 2"

    Baader Planetarium - UHC-S High Transmission Nebula Filter - 2"

    A new generation of light pollution rejection/nebula filter.

    ...
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    Model#: BPUHCS2
    $114.00

  18. Baader Planetarium Visual Narrowband O-III Filter - 1.25"

    Baader Planetarium - Visual Narrowband O-III Filter - 1.25"

    For enthusiastic deep sky observers who live in light-polluted areas, planetary nebulae and supernovae remnants will shine with the enhance contrast from the Baader Planetarium O-III Filter!

    ...
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    Model#: BPO3125
    $90.00

  19. Baader Planetarium Visual Narrowband O-III Filter - 1.25"

    Baader Planetarium - Visual Narrowband O-III Filter - 2"

    For enthusiastic deep sky observers who live in light-polluted areas, planetary nebulae and supernovae remnants will shine with the enhance contrast from the Baader Planetarium O-III Filter!

    ...
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    Model#: BPO32
    $118.00

    Out of stock

  20. Celestron - Contrast Booster Filter - 1.25"

    Celestron - Contrast Booster Filter - 1.25"

    This is our newest high quality filter that eliminates most color aberration inherent in achromatic refractor telescopes. The filter also reduces your view of the blue hue around lunar and planetary subjects. Features multi-layer coatings for 95% transmission.

    ...
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    Model#: CEL-94121
    $57.00

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