Baader Planetarium 2" Blue Eyepiece Filter - 470 nm Bandpass - FCFB-2

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  • This Baader Planetarium 2" Blue Filter delivers peak brightness with no reflections, ghosting, or stray light
  • Fine-optical plane parallel polishing to inside 30 seconds of arc
  • Similar to the Wratten #80A in terms of color, this supreme quality 2" filter is a bandpass filter with a high transmission at 470 nm
  • Images completely devoid of fale reflections are the result of professional 7-layer MC coatings
  • All Baader color filters have both male and female threads and are stackable to fit your desired combination
Questions? Let our experts help!
  • Description

    Baader 2" Blue 470 nm Bandpass Eyepiece Filter

    Freedom from Ghost images, even when stacked. The substrates of this Baader 2" filter are free of striae and polished parallel to 30 seconds in order to avoid wedge errors. It features the finest hard 7-layer multi-coatings on each face with 0.25% residual reflections. Baader filters are special in this regard as all competing filters are without anti-reflection multi-coatings. Futhermore, the coatings differ for each filter so that they match the coating performance to each color's filter curve to increase transmission while decreasing reflections.

    Extremely High Transmissions result in maximum contrast and isolation of planetary details, even with smaller telescopes.  Efficiencies of the three longpass filters (Red, Orange, and Yellow) peaks at 98%, and efficiencies of the three bandpass filters (Green, Blue, Dark Blue) achieve 70%. 

    Carefully designed spectral characteristics. Baader 2" color filters are stackable without image deterioration or ghosting, for even more narrow passbands. You can also combine them with other Baader filters for many potential possibilities.

    No reduction in sharpness, even at high magnifications or when using the filter far ahead of the focal plane (ie, digital imaging, or in front of a diagonal or binoviewer). 



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    Shipping Restrictions

    Only ships in contiguous USA.

    What's Included

    • Baader Planetarium Blue 470 nm Bandpass Filter - 2"

  • Dimensions & Specifications

    • Filter Size: 2"
    • Filter Type: Planetary Color
    • Filter Shape: Round
    • Mounted/Unmounted: Mounted
    • Wratten Number or Equivalent: #38A Blue

  • Product Guarantee

    We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.

    Manufacturer Warranty

    This product has a 2 year manufacturer's warranty against defects is provided. If you have specific questions about this product's warranty please contact Alpine Astronomical's Customer Service department by email at service@alpineastro.com.

    Return & Exchange Policy

    At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.

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