WILLIAM OPTICS FluoroStar 91 Telescope User Manual

June 5, 2024
WILLIAM OPTICS

FLUOROSTAR 91
MANUALWILLIAM OPTICS FluoroStar 91 Telescope

Warning
Never aim your telescope or finder scope at the Sun without proper solar filters installed on the front of the telescope. Doing so for even a moment may permanently damage your vision. Proper Solar filters consist of filters made by reputable manufacturers, designed to fit tightly over the front of the dew shield. Solar eyepiece filters are not considered safe, and should not be used. With proper front-mounted Solar filters, the telescope will not be harmed by viewing the Sun.

SPECIFICATION

WILLIAM OPTICS FluoroStar 91 Telescope - fig

  • Focal Length: 540mm
  • Diameter: 91mm
  • Aperture: f/5.9
  • Focuser : 3″ R &P Focuser
  • Image Circle : >43mm
  • Retracted Length: 441 mm
  • Extended Length: 510mm
  • Dew Shield Circumference: 383mm
  • Dew Shield Diameter: c1)122mm
  • Weight : 18Ibs / 4.165kg (OTA only) 1 2.291bs / 5.575kg (OTA with ring, dovetail and saddle)

PACKAGE CONTENTS

WILLIAM OPTICS FluoroStar 91 Telescope - fig1

A. Bahtinov Mask
B. OTA
C. 120mm Saddle Handle Bar
D. Visual Extention Tube
E. 2″ RotoLock Visual Back Adapter
F. Long Version Vixen-style Dovetail Plate
G. Soft Carry Case

PARTS

WILLIAM OPTICS FluoroStar 91 Telescope - fig2

A. 2″ RotoLock Visual Back Adapter
B. Visual Extention Tube
C. Camera Angle Rotation Locking Screw
D. Dual Speed 3.3″ R&P Focuser
E. Focuser Rotation Locking Screw
F. Mounting Rings / Knobs
G. 120mm Saddle Handle Bar
H. Dew Shield Locking Screw
I. Dew Shield| J. Lens Cover with Bahtinov Mask
K. Camera Angle Rotator
L. 10:1 Ratio Fine Knob & Cap
M. Long Version Vixen-style Dovetail
N. Locking Screws on Saddle Handle Bar (M4)
0. M5 Screw Holes
P. M6 Screw Holes
Q. Focuser Adjusting Knob with Thermometer
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TELESCOPE DIAGRAM

WILLIAM OPTICS FluoroStar 91 Telescope - fig3WILLIAM OPTICS FluoroStar 91 Telescope - fig4WILLIAM OPTICS FluoroStar 91 Telescope - fig5 Tilt Adjustment Screws (2 mm Allen Key)
Draw Tube Adjustment Screws (3 mm Allen Key)
Can be Removed to Attach the Moto (2 mm Allen Key & your hands)

WILLIAM OPTICS FluoroStar 91 Telescope - fig6

The focuser drawtube smoothness should be adjusted ONLY when necessary by progressively tightening the screw until you reach the desired smoothness.

NOTE: DO NOT ADJUST IT BEFORE ASKING WO

OPERATION GUIDE

How to Connect the FlattenerWILLIAM OPTICS FluoroStar 91 Telescope -
fig7 Step 1.
Remove the visual extension tube by unscrewing it from the focuser.
Step 2.
Connect the flattener to the focuser by screwing it onto the M92 thread. WILLIAM OPTICS FluoroStar 91 Telescope - fig8

ACCESSORIES MAP

Visit the W.O. webpage for details by Scanning the OR Code of the products

WILLIAM OPTICS FluoroStar 91 Telescope - fig9

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