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  1. FLI - Research Grade 8nm OIII Filter - 65mm Square Unmounted

    FLI - Research Grade 8nm OIII Filter - 65mm Square Unmounted

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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-65S-OIII-8nm

    Available - Ships in 2-4 Days

    $915.00

  2. FLI - Research Grade 5.8nm H-Beta Filter - 65mm Square Unmounted

    FLI - Research Grade 5.8nm H-Beta Filter - 65mm Square Unmounted

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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-65S-Hb-58NM

    Available - Ships in 2-4 Days

    $1,050.00

  3. FLI Research Grade LRGB Filter Set 50mm Round Unmounted

    FLI - Research Grade LRGB Filter Set - 50mm Round Unmounted

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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

    Available - Ships in 2-4 Days

    $950.00

  4. FLI - Research Grade I Filter - 65mm Square Unmounted

    FLI - Research Grade I Filter - 65mm Square Unmounted

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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-65S-I

    Available - Ships in 2-4 Days

    $1,100.00

  5. Baader Planetium f/2 Highspeed-Filter Set 2", consisting of H-α, O-III, S-II

    Baader Planetium - f/2 Highspeed-Filter Set 2", consisting of H-α, O-III, S-II

    Baader’s new ‘High Speed’ Narrowband CCD Filters come in both 1.25” and 2” diameter mounted sizes, in H-alpha, O-III, and S-II, but with an extra twist when compared to their normal filters.

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    (48 States)
    Model#: FHSS-2

    Available - Ships in 2-4 Days

    $984.00

  6. FLI - Research Grade 5nm OIII Filter - 65mm Square Unmounted

    FLI - Research Grade 5nm OIII Filter - 65mm Square Unmounted

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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-65S-OIII-5nm

    Available - Ships in 2-4 Days

    $1,195.00

  7. Astrodon - Narrowband - 50mm Unmounted H-Alpha 3 nm Filter

    Astrodon - Narrowband - 50mm 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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    Model#: HA3-50R

    Available - Ships in 2-4 Days

    $995.00

  8. FLI - Research Grade - 50mm Diameter OIII 3nm

    FLI - Research Grade - 50mm Diameter OIII 3nm

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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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    Model#: RG-50D-OIII-3nm

    Available - Ships in 2-4 Days

    $995.00

  9. Lunt - 50mm Ha Double Stack Etalon Solar-Filter (Matched)

    Lunt - 50mm Ha Double Stack Etalon Solar-Filter (Matched)

    Use the double-stack technique to reduce bandpass and get the best possible resolution and contrast from ... Learn More
    Model#: LS50FHA

    In Stock

    $998.00

  10. FLI - Research Grade 8nm H-Alpha Filter - 65mm Square Unmounted

    FLI - Research Grade 8nm H-Alpha Filter - 65mm Square Unmounted

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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-65S-Ha-8nm

    Available - Ships in 2-4 Days

    $915.00

  11. Baader Planetarium - 65mm Square LRGB Filters - UV/IR Cut L-Filter and Clear Filter

    Baader Planetarium - 65mm Square LRGB Filters - UV/IR Cut L-Filter and Clear Filter

    The Baader Planetarium LRGBC 65 mm Square CCD Filter Set conveys enhanced color separation and picture quality without irritating halos. Baader has made phenomenal CCD filters through an extensive coating-stack design and testing program.

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    (48 States)
    Model#: FLRGBC-SQ65

    Available - Ships in 2-4 Days

    $1,029.00

  12. Baader Planetarium 65mm  Square LRGB Filters - UV/IR Cut L-Filter

    Baader Planetarium - 65mm Square LRGB Filters - UV/IR Cut L-Filter

    The Baader Planetarium LRGB 65 mm Square CCD Filter Set conveys enhanced color separation and picture quality without irritating halos. Baader has made fabulous CCD filters through an expansive coating-stack outline and testing program.

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    (48 States)
    Model#: FLRGB-SQ65

    Available - Ships in 2-4 Days

    $949.00

  13. FLI - Research Grade V Filter - 65mm Square Unmounted

    FLI - Research Grade V Filter - 65mm Square Unmounted

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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-65S-V

    Available - Ships in 2-4 Days

    $1,100.00

  14. TO11-12.5HACA

    TO - 11-12.5 " H-Alpha Filter CENTER-AXIS

    The H-Alpha (Hydrogen-Alpha) filter allows safe observation of the entire solar disc, providing ... ... Learn More
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    (48 States)
    Model#: TO11-12.5HACA

    Available - Ships in 2-4 Days

    $969.00

  15. FLI - Research Grade 5nm H-Alpha Filter - 65mm Square Unmounted

    FLI - Research Grade 5nm H-Alpha Filter - 65mm Square Unmounted

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    (48 States)
    Model#: RG-65S-Ha-5nm

    Available - Ships in 2-4 Days

    $1,195.00

  16. DayStar Filters CALCIUM QUARK Filter

    DayStar Filters - CALCIUM QUARK Filter

    This new, All-In-One design marries high quality components of adapters, snouts and Daystar Calcium H filter into one simple assembly.

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    (48 States)
    Model#: DSZCH

    In Stock

    $995.00

  17. FLI - Research Grade 3nm H-Alpha Filter - 50mm Round Unmounted

    FLI - Research Grade 3nm H-Alpha Filter - 50mm Round Unmounted

    FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. They offer 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-Ha-3nm

    Available - Ships in 2-4 Days

    $995.00

  18. B1800s1

    Lunt - Blocking Filter B1800s 1.25 " - in extension tube with T2 and 2 " connection

     1.25" Lunt Solar Systems B1800 Blocking Filter in extension tube with T2 and 2" connectionFor best performance, be sure to pair your Lunt Solar Systems h-Alpha filter with the proper sized Lunt blocking filter ... Learn More
    Model#: B1800S1

    In Stock

    $998.00

  19. DayStar Filters Energy Rejection Filter 150mm Glass, Cell and Cap

    DayStar Filters - Energy Rejection Filter - 150mm Glass, Cell and Cap

    The DayStar Energy Rejection Filters come in handy when the observer needs to reduce heat load on the filters by absorbing UV wavelengths.

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    (48 States)
    Model#: ERF-150

    Available - Ships in 2-4 Days

    $900.00

  20. Lunt Calcium Module with B1200 Blocking Filter in Star Diagonal with T2 Connection

    Lunt - Calcium Module with B1200 Blocking Filter in Star Diagonal with T2 Connection

    Calcium K (Ca-K) Telescopes and Filters are used to study the ... Learn More
    Model#: LS12CAKMDD2

    In Stock

    $1,018.00

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