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  1. Astrodon - Photometric UVBRIc - Johnson-Cousins 50mm Unmounted B Edge Blackened Filter

    Astrodon - Photometric UVBRIc - Johnson-Cousins 50mm Unmounted B Edge Blackened Filter

    UVBRI filters have been the standard for photometric measurements for decades.  They have evolved over time as technology changed.  H. Johnson in the 1950s and A.W.J. Cousins in the 1970s designed these filters for photomultiplier tubes (PMT).

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    (48 States)
    Model#: B***-50R
    $400.00

  2. Optolong UBVRI Filter Set 31mm Unmounted

    Optolong - UBVRI Filter Set - 31mm Unmounted

    This photometric UBVRI filter set includes five 31mm unmounted filters: bright (U), blue (B), visual (V), red (R), and infrared (I).

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    (48 States)
    Model#: UBVRI-31U
    $740.00

  3. Optolong UBVRI Filter Set - 2" Mounted

    Optolong - UBVRI Filter Set - 2" Mounted

    This photometric UBVRI filter set includes five 2" round mounted filters: ultraviolet (U), blue (B), visual (V), red (R), and infrared (I).

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    (48 States)
    Model#: UBVRI-200
    $830.00

  4. Optolong UBVRI Filter Set - 1.25" Mounted

    Optolong - UBVRI Filter Set - 1.25" Mounted

    This photometric UBVRI filter set includes five 1.25" mounted filters: ultraviolet (U), blue (B), visual (V), red (R), and infrared (I). 

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    (48 States)
    Model#: UBVRI-125
    $685.00

  5. Custom Scientific - UBVRI 50mm Square Filter Set

    Custom Scientific - UBVRI 50mm Square Filter Set

    Custom Scientific UBVRI filters have been used in institutions and observatories around the world such as Kitt Peak, Mauna Kea, and the CTIO/Chile.

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    (48 States)
    Model#: CU-UBVRI50S-SET
    $2,500.00

  6. Custom Scientific UBVRI 50mm Unmounted Round Filter Set

    Custom Scientific - UBVRI 50mm Unmounted Round Filter Set

    Custom Scientific UBVRI filters have been used in institutions and observatories around the world such as Kitt Peak, Mauna Kea, and the CTIO/Chile.

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    (48 States)
    Model#: CU-UBVRI50-SET
    $1,550.00

  7. Custom Scientific UBVRI 1.25" Mounted Round Filter Set

    Custom Scientific - UBVRI 1.25" Mounted Round Filter Set

    Custom Scientific UBVRI filters have been used in institutions and observatories around the world such as Kitt Peak, Mauna Kea, and the CTIO/Chile.

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    (48 States)
    Model#: CU-UBVRI125-SET
    $990.00

  8. 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

  9. 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

  10. Optolong UBVRI Filter Set - 36mm Unmounted

    Optolong - UBVRI Filter Set - 36mm Unmounted

    This photometric UBVRI filter set includes five 36mm unmounted filters: bright (U), blue (B), visual (V), red (R), and infrared (I).

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    (48 States)
    Model#: UBVRI-36U
    $745.00

  11. 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

  12. FLI - Research Grade UBVRI Filter Set - 50mm Square Unmounted

    FLI - Research Grade UBVRI Filter Set - 50mm Square Unmounted

    The 50mm square UBVRI FLI research grade filter set is made to the most exacting standards in filter production. Containing ultraviolet, blue, visual, red and infrared filters, UBVRI filter sets are used as an alternative to traditional LRGB filters to enhance specific regions of the spectrum. The result is a unique combination of a false color and color image based on the photometric system developed by MacDonald observatory. ... Learn More
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    (48 States)
    Model#: RG-50S-UBVRI
    $1,045.00

  13. FLI - Research Grade V Filter - 28mm Round Unmounted

    FLI - Research Grade V Filter - 28mm Round Unmounted

    The 28mm red FLI research grade filter is made to the most exacting standards in filter production. This round unmounted filter is typically part of a UBVRI filter set intended for astrophotographic use. This "visual" photometric filter transmits wavelengths between 500 - 700nm which is the green to red portion of the visible spectrum. ... Learn More
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    (48 States)
    Model#: RG-28D-V
    $345.00

  14. FLI - Research Grade UBVRI Filter Set - 50mm Round Unmounted

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

    The 50mm UBVRI FLI research grade filter set is made to the most exacting standards in filter production. Containing ultraviolet, blue, visual, red and infrared filters, UBVRI filter sets are used as an alternative to traditional LRGB filters to enhance specific regions of the spectrum. The result is a unique combination of a false color and color image based on the photometric system developed by MacDonald observatory. ... Learn More
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    (48 States)
    Model#: RG-50D-UBVRI
    $1,045.00

  15. FLI - Research Grade U Filter - 28mm Round Unmounted

    FLI - Research Grade U Filter - 28mm Round Unmounted

    The 28mm red FLI research grade filter is made to the most exacting standards in filter production. This round unmounted filter is typically part of a UBVRI filter set intended for astrophotographic use. Ultra Violet filters are narrowband, transmitting only the ultra violet or UV portion of the spectrum. ... Learn More
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    (48 States)
    Model#: RG-28D-U
    $290.00

  16. FLI - Research Grade R Filter - 28mm Round Unmounted

    FLI - Research Grade R Filter - 28mm Round Unmounted

    The 28mm red FLI research grade filter is made to the most exacting standards in filter production. This round unmounted filter is typically part of a UBVRI filter set intended for astrophotographic use. ... Learn More
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    (48 States)
    Model#: RG-28D-R
    $345.00

  17. FLI - Research Grade I Filter - 28mm Round Unmounted

    FLI - Research Grade I Filter - 28mm Round Unmounted

    The 28mm infrared FLI research grade filter is made to the most exacting standards in filter production. Infrared narrowband filters transmit only the infrared region of the spectrum often produced by gaseous nebulae. This round unmounted filter is typically part of a UBVRI filter set intended for astrophotographic use. ... Learn More
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    (48 States)
    Model#: RG-28D-I
    $345.00

  18. FLI - Research Grade B Filter - 28mm Round Unmounted

    FLI - Research Grade B Filter - 28mm Round Unmounted

    The 28mm blue FLI research grade filter is made to the most exacting standards in filter production. This round unmounted filter is typically part of a UBVRI filter set intended for astrophotographic use. ... Learn More
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    (48 States)
    Model#: RG-28D-B
    $290.00

  19. 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

  20. 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

Items 1 to 20 of 40 total

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