William Optics Fluorostar FLT 91 Apochromatic Refractor - Checked & Tuned
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William Optics Fluorostar FLT 91 Apochromatic Refractor - Checked & TunedWilliam Optics Fluorostar FLT 91 Apochromatic Refractor - Checked & TunedWilliam Optics Fluorostar FLT 91 Apochromatic Refractor - Checked & Tuned
William Optics Fluorostar FLT 91 Apochromatic Refractor - Checked & TunedWilliam Optics Fluorostar FLT 91 Apochromatic Refractor - Checked & TunedWilliam Optics Fluorostar FLT 91 Apochromatic Refractor - Checked & Tuned

William Optics Fluorostar FLT 91 Apochromatic Refractor - Checked & Tuned

£1,975.00✓ 2 year warranty
  

:  

Out of stock due 15-20 working days

About this product

Model:  wo_flt_91_gd
Part Number:  T-FLT-91GD-RP33

Optical Bench Test

FLO tests all William Optics triplet refractor telescopes before dispatch. 

You can be confident your telescope will, from the outset, have well figured optics, negligible false colour and spherical aberration, and no astigmatism (the bane of any optical system!).

Star shapes will be round, not triangular, oval or egg-shaped!

New for 2021 - William Optics Fluorostar / FLT 91

An Apochromatic triplet refractor for visual astronomers and astrophotographers wanting very high performance from in a midsize telescope. 

The three-element optical design features a 91mm aperture using FPL-53 glass that delivers high contrast colour-free images and an impressive 0.95+ Strehl Ratio. 

Thoughtful design features like the integrated saddle handle, 360º field rotator, 2" Rotolock, large focuser knob and built-in Bahtinov mask are more than just nice touches. They genuinely help make this an excellent choice for astrophotographers. 

To use with the Flat6A III 0.8x Reducer / Flattener set the adjustable distance at 5.4mm for 55mm back focus. For the Flat68 III set the adjustable distance at 10mm which leaves 65mm back focus.

FEATURES

  • 91mm FPL-53 Apochromatic Triplet Lens with 0.95+ Strehl Ratio
  • 540mm, f/5.9 Focal Length
  • Exquisite William Optics Fit & Finish
  • Dual Speed 3.3" Rack & Pinion Focuser
  • 2" Rotolock for Secure Attachment
  • Bahtinov Mask Integrated into the Lens Cover
  • Versatile Saddle Bar Handle for Guider / Finder Mounting
  • Built-in 360º Field Rotator
  • OTA Weight 4.2kg / 5.6kg with Rings / Dovetail / Accessories
  • Supplied with a Soft Carry Case

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.

Field of View Simulator

Product Videos

What's in the box

  • FLT91 Telescope OTA
  • Vixen-style Dovetail & Tube Rings
  • Saddle Handle Bar
  • 2" Rotolock
  • Integrated Bahtinov Mask
  • Soft Carry Case

Specifications

Lens Type Apochromatic Triplet Prime Lens
Focal Length 540mm
Diameter 91mm
Focal Ratio f/5.9
Focuser Dual Speed 3.3" R&P Focuser
Colour Red | Gold | Space grey
Lens Material FPL-53
Strehl Ratio 0.95+
Camera Format Full Frame DSLR / Mirrorless / CMOS / CCD
Test Report Zygo test report available at additional cost
T-Mounts Supported Canon EF, RF Nikon F, Z Sony E Pentax K Micro Four Thirds (M4/3) FUJI X
Retracted Length 441mm without rings (485mm with rings fitted)
Extended Length 510mm
Extension Tube Length 40mm
OTA Weight 4.165Kg
Total Weight 5.575Kg
Extension Tube Weight 0.105Kg

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