William Optics Fluorostar 91 APO Triplet Refractor - Space Grey

Brand: William Optics


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  • Aperture: 91mm
  • Focal Length: 540mm
  • Focal Ratio: f/5.9
  • Bring out the best in your astrophotography or visual astronomy with the FLT 91 Triplet Refractor
  • Includes the patented William Optics Bahtinov Mask Cover for perfect focus and the Soft Carry Case to ensure safe transport.
  • The optional FLAT6AIII is available as a perfect pairing with this telescope to achieve excellence in your optics.

Product Details

  • The William Optics FLT 91 is the perfect apochromatic refractor for visual and photographic astronomers demanding excellence in a midsize telescope. The three-element optical design features a 91mm aperture using FPL-53 glass. The STM coatings and superb quality provide excellent optical performance and unmatched value.

    The Rotolock 2 inch adapter provides for a solid and efficient connection for a WO 2 inch diagonal, and other accessories.

    The retractable dew shield features a removable lens cover, with our patented Bahtinov Mask revealed by unscrewing the faceplate. The clear design allows for brighter star patterns and precise focusing for astrophotography.

    The Saddle Bar Handle offers a solid handle with a built-in dovetail chamber for use with the WO Uniguide scopes or other V-style guiding/finder scopes.

    The super-smooth field rotator includes markings for every degree and a solid thumbscrew position lock.

    The standard package comes with a soft carry case

  • specifications

    Aperture91mm (3.5")
    Dawes Limit1.27 arcseconds
    Focal Length540mm
    Focal Ratiof/5.9
    Free ShippingYes
    Highest Magnification182x
    Light Gathering Power169x
    Optical DesignTriplet Refractor
    Tube Length510mm
    Tube Weight12.2 lb
  • included items

    • William Optics Fluorostar 91 APO Triplet Refractor
    • V-Style Dovetail Saddle Plate
    • Visual Extension Tube
    • Soft Carry Case
    • Handle Bar
    • Built-in Bahtinov Mask

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