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Fluorostar 91

$2,189.39

The William Optics Fluorostar 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.

Available on backorder

SKU: ASC11817 Categories: ,
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The William Optics Fluorostar 91

 

The William Optics Fluorostar 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.

Features:

  • Rotolock: The Rotolock 2 inch adapter provides for a solid and efficient connection for a WO 2 inch diagonal and other accessories.
  • Bahtinov Mask: The retractable dew shield features a removable lens cover, with our patented Bahtinov Mask revealed by unscrewing the face plate. The clear design allows for brighter star patterns and precise focusing for astrophotography.
  • Versatile Saddle Bar: The Saddle Bar Handle offers a solid handle with a built in dovetail chamber for use with the WO Uniguide scopes or other Vixen style guiding/finder scopes.
  • New Focuser Knob: A larger fit designed for better ergonomics.
  • Field Rotator: The super smooth field rotator includes markings for every degree and a solid thumbscrew position lock.
  • Soft Carry Case: The standard package comes with a soft carry case.

Weight7.5 kg
Dimensions45 × 35 × 25 cm

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  • Lens Type: Apochromatic Triplet Prime Lens
  • Focal Length: 540mm
  • Diameter: 91mm
  • Aperture: f/5.9
  • Recommended Flatteners (Not included): FLAT 6A III x0.8  FLAT 68 III x1.0 (use of the Flat68III requires the use of a special adapter that is sold separately)
  • Focuser: Dual Speed 3.3″ R&P Focuser
  • Lens Material: FPL-53
  • Strehl Ratio: 0.95 or higher guaranteed (Scope with Strehl of 0.98+ available by special order for $400 more)
  • Camera Format: Full Frame DSLR / Mirrorless / CMOS / CCD
  • Test Report: Zygo test report available at additional cost after purchase (not available before or with purchase)
  • 48mm Wide T-Mounts Supported:
    • Canon EF, RF
    • Nikon F, Z
    • Sony E
    • Pentax K
    • Micro Four Thirds (M4/3)
    • FUJI X
  • Retracted Length: 441mm
  • Extended Length: 510mm
  • Extension Tube Length: 40mm
  • OTA Weight: 4.165Kg
  • Total Weight: 5.575Kg
  • Extension Tube Weight: 0.105Kg
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