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  1. Optolong UBVRI Filter Set 50mm Unmounted

    Optolong - UBVRI Filter Set - 50mm Unmounted

    This photometric UBVRI filter set includes five 50mm unmounted filters: bright (U), blue (B), visual (V), red (R), and infrared (I).

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    (48 States)
    Model#: UBVRI-50U
    $855.00

  2. Optolong - UBVRI Filter Set - 50mm Square Unmounted

    Optolong - UBVRI Filter Set - 50mm Square Unmounted

    This photometric UBVRI filter set includes five 50mm square unmounted filters: bright (U), blue (B), visual (V), red (R), and infrared (I).

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    (48 States)
    Model#: UBVRI-50SQ
    $901.00

  3. Optolong - SII CCD 6.5nm Filter - 50mm Square Unmounted

    Optolong - SII CCD 6.5nm Filter - 50mm Square Unmounted

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

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    (48 States)
    Model#: SIICCD65-50SQ
    $299.00

  4. Optolong - SII CCD 12nm Filter - 50mm Unmounted

    Optolong - SII CCD 12nm Filter - 50mm Unmounted

    The Optolong Sulfur II 12nm Narrowband Filter works by allowing a 12nm bandwidth of light, centered on the 672nm wavelength through, and blocking contrast-killing light pollution wavelengths from coming through.

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    (48 States)
    Model#: SIICCD12-50U
    $209.00

  5. Optolong OIII CCD 6.5nm Filter - 50mm Unmounted

    Optolong - OIII CCD 6.5nm Filter - 50mm Unmounted

    The Optolong Oxygen III 6.5nm Extra Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 500nm and radically lessens different transmissions, including wavelengths of light that are in charge of light pollution (both artificial and natural).

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    (48 States)
    Model#: OIIICCD65-50U
    $269.00

  6. Optolong - OIII CCD 6.5nm Filter - 50mm Square Unmounted

    Optolong - OIII CCD 6.5nm Filter - 50mm Square Unmounted

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    (48 States)
    Model#: OIIICCD65-50SQ
    $299.00

  7. Optolong OIII CCD 12nm Filter - 50mm Square Unmounted

    Optolong - OIII CCD 12nm Filter - 50mm Square Unmounted

    The Optolong Oxygen III 12nm Narrowband Filter transmits a 12nm bandwidth of light that is focused at 500nm and definitely decreases other transmissions, including wavelengths of light that cause light pollution (both artificial and natural).

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    (48 States)
    Model#: OIIICCD12NM-50SQ
    $249.00

  8. Optolong - L-Pro Filter - 50mm Unmounted

    Optolong - L-Pro Filter - 50mm Unmounted

    The Optolong L-Pro filter delivers better color balance by maximizing transmission band, permitting you to create pictures of broadband objects with emission spectral lines.

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    (48 States)
    Model#: LPRO-50U
    $219.00

  9. Optolong H-Alpha 7nm CCD Filter - 50mm Unmounted

    Optolong - H-Alpha 7nm CCD Filter - 50mm Unmounted

    The Optolong H-Alpha 7nm is a very narrow emission-line filter that works by permitting a 7nm bandwidth of light, focused on the 656nm wavelength through, and blocking the transmission of contrast-killing light pollution wavelengths.

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    (48 States)
    Model#: HAL7-50U
    $259.00

  10. Optolong - H-Alpha 7nm CCD Filter - 50mm Square Unmounted

    Optolong - H-Alpha 7nm CCD Filter - 50mm Square Unmounted

    The Optolong H-Alpha 7nm is a very narrow emission-line filter that works by permitting a 7nm bandwidth of light, focused on the 656nm wavelength through, and blocking the transmission of contrast-killing light pollution wavelengths.

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    (48 States)
    Model#: HAL7-50SQ
    $299.00

  11. Optolong H-Alpha 12nm CCD Filter - 50mm Unmounted

    Optolong - H-Alpha 12nm CCD Filter - 50mm Unmounted

    The Optolong H-Alpha 12nm Narrowband Filter works by permitting a 12nm light bandwidth, focused on the 656nm wavelength through, and hindering the transmission of contrast-killing light pollution wavelengths.

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    (48 States)
    Model#: HAL12-50U
    $209.00

  12. Optec - #8 Pale Yellow, 50mm diam. x 2mm thick.

    Optec - #8 Pale Yellow, 50mm diam. x 2mm thick.

    Does a better job blocking the violet and UV at the expense of ... Learn More
    Model#: 17231
    $30.00

  13. Optec - #47B Blue, 50mm diam x 2mm thick

    Optec - #47B Blue, 50mm diam x 2mm thick

    This filter is used for RGB imaging to pass the blue band ... Learn More
    Model#: 17236
    $30.00

  14. Optec - #29 Deep Red, mounted in 48mm threaded cell.

    Optec - #29 Deep Red, mounted in 48mm threaded cell.

    #29 Deep Red - Passes light longer that 610 nm. This filter is a little more effective than the #23A in dakening the sky ... Learn More
    Model#: 17437
    $45.00

  15. Optec - #23A Light Red,  50mm diam x 2mm thick

    Optec - #23A Light Red, 50mm diam x 2mm thick

    Blocks blue and green light completely, passes light longer than ... Learn More
    Model#: o17235
    $30.00

  16. Optec - #21 Orange, 50mm diam x 2mm thick

    Optec - #21 Orange, 50mm diam x 2mm thick

    Optec - #21 Orange, 50mm diam x 2mm thick ;Blocks blue completely and ... Learn More
    Model#: 17233
    $30.00

  17. Optec - #12 Yellow, 50mm diam x 2mm thick

    Optec - #12 Yellow, 50mm diam x 2mm thick

    Optec - #12 Yellow Wratten filter 50mm x2mm ... Learn More
    Model#: 17232
    $30.00

  18. IDAS Hutech 50mm Unmounted LPS Filter

    IDAS - Hutech - 50mm Unmounted LPS Filter

    Light pollution suppression (LPS) filters are designed to suppress the common emission lines generated by artificial lighting, yet allow the important nebula emission lines to pass, thus enhancing the contrast of astronomical objects, particularly emission nebulae.

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    Model#: LPS-P2-50
    $189.00

  19. FLI - Research Grade V Filter - 50mm Square Unmounted

    FLI - Research Grade V Filter - 50mm 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-50S-V
    $220.00

  20. FLI - Research Grade V Filter - 50mm Round Unmounted

    FLI - Research Grade V 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-V
    $220.00

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