SII (Sulfur) Filters

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  1. FLI - Research Grade 3nm SII Filter - 65mm Square Unmounted

    $1,250.00
    SKU: RG-65S-SII-3nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  2. FLI - Research Grade - 28mm Diameter SII 8nm

    $300.00
    SKU: RG-28D-SII-8nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  3. Astrodon - Narrowband - 1.25" Mounted SII 5 nm Filter

    $330.00
    SKU: ADO-SII5-27R

    Ships in 3-5 Days

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  4. Astrodon - Narrowband - 50mm Unmounted SII 3 nm Square Filter

    $1,250.00
    SKU: ADO-SII3-50S

    Ships in 3-5 Days

    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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  5. Astrodon - Narrowband - 50mm Unmounted SII 3 nm Filter

    $995.00
    SKU: ADO-SII3-50R

    Ships in 3-5 Days

    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),

    FREE SHIPPING(48 States)
  6. Astrodon - Narrowband - 1.25" Mounted SII 3 nm Filter

    $490.00
    SKU: ADO-SII3-27R

    In stock

    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),

    FREE SHIPPING(48 States)
  7. Astrodon - Narrowband - 50mm Unmounted SII 5 nm Square Filter

    $875.00
    SKU: ADO-SII5-50S

    Ships in 3-5 Days

    When it comes to Narrowband filters, no one knows more or does it better than Don Goldman of Astrodon Filters. 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, 501 nm), sulfur (SII, 672nm) and others.

    FREE SHIPPING(48 States)
  8. Astrodon - Narrowband - 50mm Unmounted SII 5 nm Filter

    $725.00
    SKU: ADO-SII5-50R

    Ships in 3-5 Days

    When it comes to Narrowband filters, no one knows more or does it better than Don Goldman of Astrodon Filters. 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, 501 nm), sulfur (SII, 672nm) and others.

    FREE SHIPPING(48 States)
  9. Astrodon - Narrowband - 36mm Unmounted SII 5 nm Filter

    $435.00
    SKU: ADO-SII5-36R

    In stock

    FREE SHIPPING(48 States)
  10. FLI - Research Grade - 28mm Diameter SII 5nm

    $460.00
    SKU: RG-28D-SII-5nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  11. FLI - Research Grade - 28mm Diameter SII 3nm

    $485.00
    SKU: RG-28D-SII-3nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  12. FLI - Research Grade 5nm SII Filter - 65mm Square Unmounted

    $1,195.00
    SKU: RG-65S-SII-5nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  13. FLI - Research Grade 8nm SII Filter - 65mm Square Unmounted

    $915.00
    SKU: RG-65S-SII-8nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  14. FLI - Research Grade 3nm SII Filter - 50mm Square Unmounted

    $1,250.00
    SKU: RG-50S-SII-3nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  15. FLI - Research Grade 5nm SII Filter - 50mm Square Unmounted

    $875.00
    SKU: RG-50S-SII-5nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  16. FLI - Research Grade 8nm SII Filter - 50mm Square Unmounted

    $495.00
    SKU: RG-50S-SII-8nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  17. FLI - Research Grade - 50mm Diameter SII 3nm

    $995.00
    SKU: RG-50D-SII-3nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  18. FLI - Research Grade - 50mm Diameter SII 8nm

    $495.00
    SKU: RG-50D-SII-8nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  19. FLI - Research Grade - 50mm Diameter SII 5nm

    $725.00
    SKU: RG-50D-SII-5nm

    Ships in 1-2 Weeks

    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.

    FREE SHIPPING(48 States)
  20. Optolong - SII 6.5nm Filter - EOS APS C Clip

    $239.00
    SKU: OPO-EOSAPS-SII65

    Ships in 3-5 Days

    The Optolong Sulfur II 6.5nm Extra Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 672nm and tremendously decreases different transmissions, including wavelengths of light that cause light pollution (both artificial and natural).

    FREE SHIPPING(48 States)
Showing 1 to 20 of 40 total
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