Baader Planetarium 1.25" Orange Eyepiece Filter - 570 nm Longpass - FCFO-1

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  • This Baader 1.25" Orange Filter provides maximum brightness without reflections, ghosting, or stray light
  • Fine optical plane parallel polished to inside 30 seconds of arc
  • Comparable to the Wratten #21 in color, this high quality Baader filter is a longpass filter with a high 570nm transmission
  • Skillfully coated with 7 layers of multi-coatings for an image with no false reflections
  • Stackable 1.25" filter cell with both male and female threads to enable any combination of filters you desire Questions? Let our experts help!
  • Description

    Baader 1.25" Orange 570 nm Longpass Filter

    Freedom from Ghost images, even when stacked. To avoid wedge errors, striae-free substrates are polished parallel to 30 seconds. First-class 7-layer hard multi-coatings on each face have 0.25% residual reflections. Baader filters are unique in this way as no other colored filter includes anti-reflection multicoatings. In addition, these coatings differ depending on the filter so that the coating performance matches the filter curve of each color. This increases transmission while decreasing reflections.

    Extremely High Transmissions deliver maximum contrast to highlight planetary details, even when smaller telescopes are being employed. The three Baader longpass filters (Red, Orange, and Yellow) have peak efficiencies of 98%, while the three Baader bandpass filters (Green, Blue, and Dark Blue) top out at 70%.

    Carefully designed spectral characteristics.  Filters may be stacked without image degradation or ghosting, in order to provide even narrower passbands.  Or, combine with any of the other Baader filters for interesting 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 Orange 570 nm Longpass Eyepiece Filter - 1.25"

  • Dimensions & Specifications

    • Filter Size: 1.25"
    • Filter Type: Planetary Color
    • Filter Shape: Round
    • Mounted/Unmounted: Mounted
    • Wratten Number or Equivalent: #21 Orange

  • 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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