William Optics 9mm Swan Eyepiece - 1.25"

  • Sale
  • Regular price $79.00
  • William Optics 9mm Swan Eyepiece - 1.25"

    • Sale
    • Regular price $79.00
    • ITEM #



    William Optics 9mm Swan Eyepiece - 1.25"

    William Optics 9mm SWAN Eyepiece

    The Swan eyepieces are super wide angle designs with 72??? apparent field of view. They use simple but sophisticated five-lens optical systems for generally higher contrast than the more complicated optical designs used in some other super wide angle eyepieces that use up to eight lenses. All lenses are fully multicoated for high light transmission. Lens edges and internal field stops are blackened to reduce internal reflections and improve contrast. The eyepiece rubber grip ring is useful for safer handling of the heavier 2ƒ??????????? eyepieces in cold weather when wearing gloves. The eyepieces have soft roll down rubber eyecups for eyeglass use. They can be used for all types of observing, both day and night!

    The William Optics SWAN 9mm Eyepiece has soft roll down rubber eyecups for eyeglass use. They can be used for all types of observing, with all telescope types, but they are recommended for use with focal ratios up to f/6 and above. Dust caps are provided for both ends of each eyepiece. A soft protective drawstring-equipped velvet storage bag is standard equipment with each.

    This 5-element super-wide angle 9mm SWAN EPƒ???????????s panoramic views at 72 deg. F.O.V. will leave you speechless!

    William Optics 9mm SWAN Eyepiece Features

    • Fully Multicoated lenses for excellent transmittance..
    • Reduced chromatic aberration.
    • Improved sharpness and contrast throughout the field.
    • No internal reflections, kidney beaning, pin-cushion or other distortions.
    • Smooth design for no hook up in your focuser.
    • Threaded for filter usage.
    • Rubber grip ring for safe, comfortable handling.
    William Optics Product Number: SWAN9

    Additional Information

    Case IncludedNo
    Dust Caps IncludedYes
    Eye Guard IncludedYes
    Eye Relief 12mm
    Eyepiece Apparent FOV72 degrees
    Eyepiece Eye Relief12mm
    Eyepiece Special FeatureNone
    Field StopNot supplied by manufacturer
    Focal Length9mm
    Lens Elements & Groups5 elements & 4 groups
    ManufacturerWilliam Optics
    ModelWilliam Optics Swan
    Optical DesignWide Angle
    Warranty2 Year Warranty

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    • 9mm Swan EP ,Thinking about more eyepieces for my Binoviewer & looking at the review on this eyepiece ; the eyepiece was liked , but the 12mm eye relief could have been better , hard to look through ; That said I now wonder how they would preform in my W

      These eyepieces would be a good choice for a binoviewer as long as you are okay with the 12mm of eye relief. The SWAN eyepieces are very good quality for the price.

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