William Optics
William Optics Fluorostar 91
William Optics Fluorostar 91
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A precision-engineered apochromatic triplet refractor designed for discerning astronomers and astrophotographers. This mid-sized telescope features a 91mm aperture with FPL-53 glass, delivering sharp, high-contrast images and an impressive Strehl ratio exceeding 0.95.
Equipped with user-centric features, the FLT91 includes an integrated saddle handle, a 360º field rotator, a dual-speed 3.3" Rack & Pinion focuser, and a 2" Rotolock system. These enhance usability and provide stability for both visual and photographic applications.
Astrophotographers will find the built-in Bahtinov mask invaluable for achieving perfect focus effortlessly. Compatible with the Flat 6AIII, Flat 68III, and Ultra Flat 91, the FLT91 allows precise back-focus adjustments.
Constructed with William Optics' signature quality, the FLT91 is both lightweight and durable, weighing 4.2 kg and 5.6 kg fully equipped. It comes with a soft carry case for easy transportation and protection.
Ideal for capturing celestial phenomena, the William Optics FLT91 is a top choice for those seeking advanced optical performance in a portable package.
- Lens Type
- Triplet APO Prime Lens
- Focal Length
- 540 mm
- Diameter
- 91 mm
- Focal Ratio
- f/5.9
- Image Circle
- 43 mm
- Focuser
- 3.3" R&P Focuser Compatible with EAF
- Focuser Travel
- 95 mm
- Adapter Included
- M92 Rotator M92 Extender M92 → 2" RotoLock
- Optional Flattener
- FLAT 68III 1.0x (requires adapter) FLAT 6AIII 0.8x (requires adapter) Ultra Flat 91 0.79x
- Camera Format
- Full Frame APS-C M4/3
- Dovetail Type
- Vixen
- Tube Length
- 441 mm - 510 mm
- OTA Weight
- 4.16 kg / 9.17 lbs
- Total Weight
- 5.57 kg / 12.28 lbs
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Yes. On top of the manufacturer's warranty, we also offer a Replacement Guarantee on all online orders. In the event that the product is defective or damaged during shipping, you will receive a replacement.
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We'll refund you 90% if you cancel before dispatch. Cancellations after dispatch are complicated. Take a look at the our Policy here
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We have strict return/refund policies as a company that deals with fragile products. Casual returns are not permitted. Items that are not damaged in transit or defective cannot be returned.So please take a moment to review our Refund Policy.
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